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Thứ Năm, 9 tháng 5, 2013

U.S. spending on medicines falls for first time in 55 years

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Patent expirations on big-name drugs such as Lipitor and Plavix has resulted in modestly less spending on medicines in the United States for the first time in at least 55 years, according to a report released on Thursday.

Overall U.S. spending on medicines totaled $325.8 billion in 2012, down 1 percent from 2011, according to the report from the IMS Institute of Healthcare Informatics. Adjusting for population, per capita spending fell 3.5 percent to $898.

The drop - the first since IMS began tracking drug prices in 1957 - marks the beginning of what is expected to be several years in which U.S. spending on prescription drugs will grow more slowly than overall healthcare costs, said Michael Kleinrock, director of research development at IMS.

The shift is being made at the same time the Affordable Care Act, designed to improve access to healthcare insurance, gets set to take effect next year.

The biggest factor behind the drop was the availability of lower-cost generic versions of drugs such as Pfizer Inc's cholesterol-lowering Lipitor. New generics contributed $28.9 billion to last year's reduction in medicine spending.

The pharmaceutical industry has been grappling with an unprecedented "patent cliff" that ratings agency Fitch has estimated will mean the loss of more than $70 billion in revenue from brand-name medicines between the second half of 2011 and the end of 2015.

Last year's patent expiries also included Sanofi SA and Bristol-Myers Squibb Co heart drug Plavix, and AstraZeneca Plc's antipsychotic, Seroquel.

Higher health costs and a weak economy have led many Americans to cut back on visits to the doctor. Admissions to hospitals also remained on the wane and the flu season in early 2012 was relatively mild.

"Patients are being influenced by higher out-of-pocket costs as employers seek to rein in insurance costs," Kleinrock said.

IMS also found that visits to emergency rooms increased 5.8 percent last year.

"Some choices that people are making may not be in everyone's best interest," Kleinrock said, noting that some emergency room visits could be by people putting off needed care.

U.S. healthcare costs remain heavily concentrated among relatively few patients suffering from multiple chronic conditions, cancer or other serious diseases.

Within the population of commercially insured people under the age of 65, 5 percent of them incurred 51 percent of total healthcare costs - or $15,684 per person in 2012.


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Thứ Ba, 7 tháng 5, 2013

US has more 'first day' newborn deaths than any other industrialized nation, report says

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In the United States, more babies die on the first day of life than in any other industrialized country, according to a new report.

Each year, about 11,300 U.S. babies die the day they're born, which is 50 percent more deaths than all other industrialized countries combined, according to the report from the charity organization Save the Children.

When the organization ranked countries by the rate of death on the first day of life, the United States placed behind 67 others, including Mexico, Saudi Arabia and Kuwait.

The report ranked 186 countries in all. Somalia has the highest first-day death rate, with 18 deaths per 1,000 live births, while Luxemburg, Singapore and Sweden have among the lowest, with less than 0.5 deaths per 1,000 live births. The rate of first-day death in the United States is 2.6 deaths per 1,000 live births.

The relatively high rate of preterm birth in the United States compared to other industrialized countries contributes to the nation's high rate of first-day deaths, said Carolyn Miles, president and CEO of Save the Children.

And a lack of access to prenatal care for poor women contributes to the high rate of premature birth, Miles said. Women need access to proper prenatal care, in part to understand their risk of preterm birth and other pregnancy complications, Miles said.

Although overall mortality has dropped worldwide for children under 5 years old, from 12 million deaths in 1990 to 7 million yearly deaths today, less progress has been made in reducing newborn deaths. In 2011, 3 million babies died in the first month of life, one-third of whom died on the day they were born, Save the Children says.

Globally, India has the most first-day deaths, with more than 300,000 yearly, followed by Nigeria, with 90,000 a year, the report said.

In developing countries, simple solutions could reduce the rate of first-day deaths. More than 1 million babies could be saved each year with access to four low-tech products, costing between 13 cents and $6, Save the Children says. These products are: resuscitation devices to help babies breathe; the antiseptic chlorhexidine to prevent umbilical cord infections; injectable antibiotics to treat infections; and antenatal steroid injections to help preterm babies' lungs develop.

"It really it's about simple solutions," Miles said.

Copyright 2013 MyHealthNewsDaily, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.


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Thứ Sáu, 26 tháng 4, 2013

New bird flu: What the first 82 cases reveal

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    A breeder, whose business has been affected by the H7N9 bird flu virus, walks his ducks along a road in Changzhou county, Shandong province.REUTERS/Stringer

Although health officials still haven't confirmed the species of animal that is the source of the H7N9 bird flu outbreak in China, most people who fell ill had contact with birds or pigs, according to a new report.

The report, published online April 24 in the New England Journal of Medicine, describes an investigation of the 82 people who were infected with the virus from the beginning of the outbreak (in February and March) through April 17.

So far, health officials know of 108 people who've fallen ill with the new strain of bird flu, 22 of whom have died, according to the World Health Organization.

The new report says that of the 77 patients who could report whether they had been in contact with animals, 59 patients, or 77 percent, reported recent exposure to animals, the report said. Most (76 percent) had contact with chickens (including four who were poultry workers), while 20 percent reported exposure to ducks, and 7 percent to swine, the report said.

The researchers said they suspect the source of H7N9 infections to be poultry. This agrees with the result of a study published today, which points to poultry markets as the likely source of H7N9 bird flu infections.

Other findings from the investigation of the 82 cases include:

-- H7N9 has a high death rate: About 21 percent of patients who fell ill with the virus died. That's a higher death rate than that of severe acute respiratory syndrome (SARS), which killed about 9.6 percent of those who contracted the virus between 2002 and 2003. However, the new bird flu is so far not as deadly as the H5N1 bird flu virus, which caused an outbreak in 2003 and 2004 and has a mortality rate of 60 percent.

-- It takes about four days to become very sick: The average time between onset of H7N9 flu symptoms and hospitalization was 4.5 days, the researchers said. That's longer than the time between the onset of symptoms and hospitalization for the H5N1 strain of bird flu, which is about seven days, according to earlier studies.

-- Most patients are male: Seventy-three percent of these cases in the study were male. Patients ranged in age from 2 to 89, but 46 percent of cases occurred in people ages 65 and older.

-- No confirmed human-to-human transmission: Nearly all of the 82 cases were not connected, and they occurred across six regions of China. In two cases, health officials could not rule out the possibility that sick individuals caught the virus from family members. However, there is no evidence of sustained human-to-human transmission.

More investigation is needed not only to identify patients who may be sick with the virus, but also to determine risk factors for becoming ill (some people may not get sick), the researchers said.

A ban on the sale of poultry in market stalls, disinfection of markets or market closures may need to be considered to prevent the spread of the virus from animals to people, the researchers said.

Copyright 2013 MyHealthNewsDaily, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.


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Thứ Hai, 15 tháng 4, 2013

First ever alcohol-free bar set to open in Chicago

The Other Side, a new bar in a Chicago suburb, is set to open April 27.  While it may look like any other typical bar, it has one major distinction – none of the drinks served will contain any alcohol.

The Other Side will be the first sober bar to open its doors in the Midwest, Counsel and Heal reported.  A group of friends came up with the idea for the bar after they had come together for the funeral of a mutual friend who had died of heroin addiction.  The friends, many of whom have also struggled with addiction themselves, collectively know at least 100 people who have died from substance overdoses within the past few years.

The group – now members of The Other Side’s board of directors – said they found it difficult to have sober fun in the suburbs that doesn’t involve going to movie theaters or bowling alleys.

"We're still young, and we want to hang out," 22-year-old Chris Reed, president of the non-profit group, the New Directions Addiction Recovery Center, told the Arlington Heights Daily Herald. "You can't hang out with 40 people at your house."

The Other Side will have the same amenities that most bars have – such as pool tables, TVs and sometimes live music.  The bar is a not-for-profit enterprise, and all its proceeds will go toward funding for drug education and rehabilitation treatments.

Click for more from Counsel and Heal.


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Thứ Năm, 4 tháng 4, 2013

CDC investigates first human cases of new bird flu strain

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A new strain of bird flu has killed four people in China and sickened at least seven others, according to Chinese media reports. Chinese health officials blame a new strain of H7N9, an influenza virus detected in birds, but never before seen in humans.

Officials at the U.S. Centers for Disease Control and Prevention are monitoring the situation, but they say it's too early to recommend any precautions for the general public.

"While cases have been seen of human infections with this virus in China, we haven't seen any cases in the United States or indeed in any country outside China so far," said Dr. Joseph Bresee, chief of the Epidemiology and Prevention Branch of the CDC's Influenza Division.

Although this new strain of H7N9 can apparently spread from birds to humans, there are no confirmed cases of human to human transfer.

Nevertheless, flu viruses always pose a threat of mutating into something more contagious. So, as a routine precaution, steps are already underway toward developing a vaccine should it be needed.

"We started that process now, and we can stop it if it turns out this virus doesn't pose a threat worthy of vaccine production," Bresee said. "But it's good to get it started as early as you can because vaccines may take a long time to make."


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FIRST LAW OF ITS KIND:Indiana Bill Would Require Armed School Officials

Indiana lawmakers are pushing to make their state the first in the nation to require every school to have an armed employee on site, a proposal that aligns with recent recommendations from a National Rifle Association study. 

The proposal in Indiana advanced through a House committee Tuesday. It goes beyond a law signed last month in South Dakota that would allow -- but not require -- teachers to carry guns. 

The Indiana bill would mandate that one officer in every public and charter school have a loaded weapon during school hours. The officers could be police officers or other non-educators but also could be teachers or principals. 

The proposal is the latest precedent-setting bill being advanced in the wake of the mass shooting at a Connecticut elementary school. Some states have tightened background checks and bans on assault-style rifles in a bid to reduce the supply of weapons, while others have pushed to make guns more available for purposes of self-defense. 

Supporters of the Indiana bill say it would prevent tragedies like the one in Newtown, Conn., where 20 students and six educators died. The NRA earlier this week recommended that schools try to train and arm at least one staff member.   

"I've been approached by several teachers that would love the ability to have their natural right to self-defense recognized and would gladly do this without being paid," Indiana bill sponsor Rep. Jim Lucas, a Republican, said. 

The House Education Committee voted 9-3 to approve the bill, advancing it to the Republican-dominated House for consideration. The Senate would also have to approve the measure. 

But opponents say they're concerned the proposal was rushed and is unnecessary. 

Schools Superintendent Glenda Ritz said Wednesday she believes such decisions on school security should be made by local school districts without mandates from the Legislature. 

No states currently require armed employees in schools. 

The Associated Press contributed to this report.


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Thứ Ba, 26 tháng 3, 2013

Obama to name first female director of Secret Service

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    Shown here is Julia Pierson, whom President Obama has appointed to lead the Secret Service.Secret Service

President Obama plans to appoint agent Julia Pierson as the first female director of the Secret Service, a senior official confirmed to Fox News -- marking a shift for an agency marred by last year's prostitution scandal. 

The appointment of Pierson to the top job in the agency that protects the president and other top officials could help to address concerns about the agency's culture. 

Pierson, who most recently served as Secret Service chief of staff, will take over the top job from Mark Sullivan, who announced his retirement last month. The agency faced intense criticism during Sullivan's tenure for the prostitution scandal during preparations for Obama's trip to Cartagena, Colombia, last year. 

The incident raised questions within the agency -- as well as at the White House and on Capitol Hill -- about the culture, particularly during foreign travel. In addition to protecting the president, the Secret Service also investigates financial crimes. 

Obama is expected to announce Pierson's appointment Tuesday. Pierson does not need to be confirmed by the Senate. 

Thirteen Secret Service employees were caught up in last year's prostitution scandal. After a night of heavy partying in the Caribbean resort city of Cartagena, the employees brought women, including prostitutes, back to the hotel where they were staying. The incident became public after one agent refused to pay a prostitute and the pair argued about payment in a hotel hallway. 

Eight of the employees were forced out of the agency, three were cleared of serious misconduct and at least two have been fighting to get their jobs back. 

The incident took place ahead of Obama's arrival in Colombia and the service said the president's safety was never compromised. But news of the scandal broke during his trip, overshadowing the summit and embarrassing the U.S. delegation. 

The incident prompted Sullivan to issue a new code of conduct that banned employees from drinking within 10 hours of starting a shift or bringing foreign nationals back to their hotel rooms. 

Sullivan apologized for the incident last year during testimony before a Senate panel. 

The Associated Press contributed to this report. 


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Thứ Hai, 25 tháng 3, 2013

VOCAL OPPOSITION:Detroit Emergency Manager May Have Tough First Day

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    March 14, 2013: File photo of the skyline of the city of Detroit. Kevyn Orr, Detroits state-appointed emergency manager, has yet to step into his Detroit office, but the acclaimed bankruptcy lawyer knows the clock already is ticking down on the future of the city.AP

A bankruptcy lawyer and turnaround expert tasked with reviving Detroit's beleaguered finances could be greeted by a crowd of protesters as he arrives at work Monday, then plans to spend his first day meeting with some city officials who for months fought against creating his job at all.

Kevyn Orr is under no illusions that he'll be treated as a hero when he begins his duties as the Motor City's emergency manager, an appointment that makes Detroit the largest city in the U.S. ever put under state control. But while there are plenty of sacrifices -- including Orr's resignation from a powerful law firm where he was a partner -- Orr says he is motivated by the opportunity to engineer one of the greatest fiscal turnarounds in U.S. history.

"I'm a worker bee. I'm not a honey bee," Orr, 54, told The Associated Press in an interview. "My set-in-stone plan is to get to the office ... and start meeting folks."

A review team spent two months scrutinizing Detroit's books and reported to Gov. Rick Snyder that the city was in a financial emergency, citing its long-term debt of more than $14 billion and $327 million budget deficit.

Snyder agreed and earlier this month announced Orr, a Washington attorney who represented automaker Chrysler LLC during its successful restructuring, as the man for an even larger fix-it task. State law allows emergency managers to negotiate labor contracts and deals with vendors. He can sell off city assets to raise money and cut the salaries of elected officials to save money.

Opponents, led by a vocal group of Detroit clergy and residents say the law snatches power from elected officials. Detroit is a heavily Democratic city with a predominantly black population Snyder is a Republican. A prominent national civil rights leader, the Rev. Jesse Jackson, has called for mass demonstrations and protests outside City Hall.

Orr insists he has no immediate plan of action other than getting a sense of the city's priorities.

"You really want to look into the swimming pool to see if there is water in there before you dive in," said James Spiotto, a municipal bankruptcy expert at the Chicago-based Chapman and Cutler law firm.

But turnaround specialist James McTevia said he finds it hard to believe that Orr enters the job without any idea about what he intends to do. McTevia, who has closely followed the Detroit situation, suggests that one of his first steps should be an immediate freeze on debt spending.

"The first step in resolving a serious financial problem is to stop fueling the fire by spending money you don't have," McTevia said.

Early success could be crucial for Orr to win over citizens who are skeptical about whether an emergency manager really is needed, bankruptcy expert Doug Bernstein said. Such victories can be as simple as getting "street lights on and get police on the street," he said.

"Public safety is paramount," said Bernstein, managing partner of the Banking, Bankruptcy and Creditors' Rights Practice Group for the Michigan-based Plunkett Cooney law firm. "This is such a hot area where people are passionate about whether there should or not be an emergency manager. It would likely go a long way to convince those who are against, or otherwise opposed to the concept, that this can lead to something good or rehabilitation for the city."

Beyond public safety, a host of other problems await Orr -- including health care costs, pension concessions, privatizing services if necessary and, finally, weighing whether the only real solution is municipal bankruptcy.

"Maybe he means he doesn't have the details of it yet, but I hope he has some idea what the major issues are," Wayne State University law professor Peter Henning said of Orr. "Mr. Orr has to deal with the threat of bankruptcy. This is a more immediate issue and he has to make a decision fairly quickly whether to put the city into bankruptcy or not."

Then he has to match revenue and spending.

"This is the idea of downsizing the city so that the costs more closely match the amount Detroit brings in," Henning said. "On the revenue side, something has to be done to stabilize the tax base. That's all easier said than done and will take years, probably well beyond Mr. Orr's term."

Pamela Amato, a former emergency financial manager for tiny Three Oaks in southwestern Michigan, said when she took the job in 2009, she did not jump straight into the finances. Three Oaks had a $600,000 deficit and was nearly devoid of cash. It took less than a year to turn the village around. Amato says listening to officials and residents was the key.

"I wanted to get a sense from the people who lived there and who were in governance as to what was going on and used that information to chart my own course," she said. "I let them know that we either succeeded together or we failed together."

Orr has met with people in Detroit's business and foundation communities, attending some dinners and receptions. He plans to commute between Detroit and his home in the Washington, D.C., area during the time it takes to fix Detroit.

"I was very comfortably placed in my private law practice at my firm that I adored," Orr said, pointing out that he had been picked to go to open a Miami office before the offer to become Detroit's emergency manager came from "out of the blue."

Jevonsha Johnson, 28, said she wants Orr to keep in place efforts under Mayor Dave Bing to level as many of the city's 30,000 or more vacant houses as funds allow. There are two adjacent to Johnson's newer wood-framed bungalow in the city's north end and another across the street.

"It don't make you feel safe," Johnson said. "The other new houses over here have been broken into several times. My neighbor next door told me a couple times that they broke in while his wife and daughter were there."

Although Orr said he likes what he has seen in parts of the city -- downtown, resurgent Midtown, the strong cultural and central business districts -- he acknowledges other neighborhoods are "in need of some TLC (tender loving care)."

Amid all these problems, he acknowledges there's a risk of being unable to solve them, though he insists he will within the 18 months dictated under Michigan's emergency manager law.

"Failure is not an option," Orr said. "It's just a question of designing the architecture around what can be creating a future -- and a sustainable future -- for the city."


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Thứ Sáu, 15 tháng 3, 2013

Device keeps liver 'alive' outside body in medical first

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    Organ some five minutes after connection to the OrganOx Metra, now fully perfused and at physiological temperature.Oxford University

A donated human liver has been kept alive, warm and functioning outside a human being on a newly-developed machine and then successfully transplanted into patients in a medical world first.

A British team of doctors, engineers and surgeons announcing the achievement on Friday said it could be common practice in hospitals across the developed world within a few years, up to doubling the number of livers available for transplant.

So far the procedure has been performed on two patients on Britain's liver transplant waiting list and both are making excellent recoveries, the medical team told a news conference.

"It was astounding to see an initially cold, grey liver flushing with colour once hooked up to our machine and performing as it would within the body," said Constantin Coussios, a professor of biomedical engineering at Oxford University and one of the machine's co-inventors.

"What was even more amazing was to see the same liver transplanted into a patient who is now walking around."

Currently livers destined for transplant are kept "on ice" in a process which cools them to slow down their metabolism and does not keep them functioning as they would inside a body.

This system has worked for several decades, but can also often lead to livers becoming damaged and rendered unfit for use in patients who need them.

Surgeons say keeping livers "on ice" beyond 14 hours starts becoming risky, although they can last up to 20 hours.

Hepatitis infection, alcohol abuse and drug-induced cholestasis - a blockage in the flow of bile from the liver - can all cause liver failure. Some patients with liver cancer can also benefit from a transplant.

Around 13,000 liver transplants are carried out each year in Europe and the United States, but there is a combined waiting list of around 30,000 patients who need a new liver.

Experts say up to a quarter of these patients die while they are waiting. At the same time, more than 2,000 livers are discarded every year because they are either damaged by oxygen deprivation or do not survive the cold preservation process.

The new technology, developed by Coussios together with Peter Friend, director of the Oxford Transplant Centre, preserves the liver at body temperature and "perfuses" it - supplying it with oxygenated red blood cells to keep it alive.

"This device is the very first completely automated liver perfusion device of its kind," Coussios said. "These first clinical cases confirm that we can support human livers outside the body, keep them alive and functioning on our machine and then, hours later, successfully transplant them into a patient."

"I feel so alive"

The device can keep a liver functioning normally - just as if in a person, with blood circulating through its capillaries and bile being produced - outside the body for 24 hours or more.

The results from the first two transplants using the new technology, carried out at King's College Hospital (KCH) in London last month, suggest the device could be useful for all patients needing liver transplants, Field told reporters.

The new device could also mean livers which would otherwise be discarded as unfit for transplantation could be preserved and made viable - potentially as much as doubling the number of organs available for transplant, he said.

"If we can introduce technology like this into everyday practice, it could be a real, bona fide game changer for transplantation as we know it," said Nigel Heaton, director of transplant surgery at KCH and part of the team that carried out the first two transplants using the device.

Coussios and Friend have been researching the technology for the device since 1994 and are developing it through an Oxford University spin-off company called OrganOx.

The first person to receive a transplanted liver kept alive on the OrganOx system was 62-year-old Briton Ian Christie. He is still recovering from the surgery but said in a statement he was getting better day by day. "I just feel so alive," he said.

Christie was told last year he had cirrhosis of the liver and had only 12 to 18 months to live unless he got a transplant. "I was placed on the waiting list but...I was very worried."

Having been through the surgery, he said: "I feel better than I've felt for 10 to 15 years, even allowing for the pain and wound that's got to heal."

The team now plans to run a pilot trial with 20 more liver transplant patients at KCH. Coussios said successful results of that trial would allow OrganOx to apply for marketing authority, meaning the device could be on the market by as early as 2014.


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Thứ Hai, 4 tháng 3, 2013

Mitt Romney vows to remain a force in politics, admits mistakes in first interview since 2012 election

Mitt Romney, the 2012 Republican presidential nominee, gave an unflinching review Sunday of his unsuccessful campaign, admitting his shortcomings and disappointments but vowing to remain a force in American politics.

“It kills me not to be there, not to be in the White House doing what needs to be done,” Romney told “Fox News Sunday” in his first interview with wife Ann after the election. “It’s hard.”

In the wide-ranging interview, Romney and his wife also talked about everything from campaign missteps to heartbreaking Election night results to how President Obama has led the country so far in his second term.

“The president is out campaigning to the American people, doing rallies around the country, flying around the country and berating Republicans and blaming and pointing,” Romney said. “That causes the Republicans to retrench and to put up a wall and to fight back.”

Romney told Fox that Obama appears to be failing in his handling of the $85 billion in spending cuts this year that automatically kicked in this weekend, in part because he failed to broker a less drastic option between Democrats and Republicans.

“No one can think that that's been a success for the president,” he said. 

Romney, a former Massachusetts governor, spoke in detail about remarks he made during a private event, regarding not being able to reach 47 percent of voters, which critics exploited late in the campaign.

“It was a very unfortunate statement,” Romney told Fox. “It's not what I meant. I didn't express myself as I wished I would have. You know, when you speak in private, uh, you don't spend as much time thinking about how something could be twisted and distorted. And it could come out wrong. … There's no question that hurt and did real damage to my campaign.

He also acknowledges he and his campaign failed to reach out to minorities as well as the Obama campaign.

“We weren't effective in my message primarily to minority voters, to Hispanic-Americans, African-Americans, other minorities,” Romney said. “That was a real mistake.”

Romney said he is finished will elected office, but will continue to try to help the Republican Party, despite having a less powerful voice.

“I lost and so I'm not going to be telling the Republican Party, ‘Come listen to me, the guy who lost,’ ” Romney said. “I'm not going to disappear. … I care about America. I care about the people that can't find jobs. I care about the fact that we're racking up larger deficits and putting the peril of the future generation very much in play.”


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Giuliana Rancic puts marriage first, baby second

Giuliana Rancic says she puts her marriage over motherhood.

Rancic, who welcomed son Edward Duke via surrogate last August, told US Weekly that she and her husband Bill Rancic make their relationship a priority, even with the “cutest baby ever” in the house.

"We're husband and wife, but we're also best friends, and it's funny because a lot of people, when they have kids, they put the baby first, and the marriage second," the 37-year-old breast-cancer survivor told the magazine. "That works for some people. For us, I find, we put our marriage first and our child second, because the best thing we can do for him is have a strong marriage."

Click for more from Us Weekly.


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Thứ Năm, 21 tháng 2, 2013

Mosquitoes learn to ignore insect repellent DEET after first smell

DEET, one of the most widely used ingredients in insect repellent, has been found to actually lose its effectiveness against mosquitos, BBC News reported.

At first, mosquitos are repelled by their initial encounter with the substance, but they then get used to the smell and later ignore it, according to scientists from the London School of Hygiene and Tropical Medicine.

The researchers noted more research needed to be done on DEET, as well as repellent alternatives.

“The more we can understand about how repellents work and how mosquitoes detect them, the better we can work out ways to get around the problem when they do become resistant to repellents,” Dr. James Logan, from the London School of Hygiene and Tropical Medicine told BBC News.

DEET, chemical name N,N-Diethyl-meta-toluamide, was created by the U.S. military in 1946 and has been determined not to present any health concerns to the general population.  The oil generally works by creating an unpleasant smell for insects, repelling them rather than killing them.

To determine DEET’s effectiveness, the researchers from the London School tempted some mosquitos in the lab with an arm covered in DEET.  At first the mosquitos were repelled, but a few hours later, the mosquitos were tested again – and the scientists found the DEET was less effective in deterring the insects.

After placing electrodes on the mosquitos’ antennae, the researchers were able to measure what was going on.  Ultimately, the mosquitos were growing less sensitive to the chemical.

“There is something about being exposed to the chemical the first time that changes their olfactory system - changes their sense of smell - and their ability to smell DEET, which makes it less effective,” Logan told BBC News.

The study was published in the journal PLOS ONE.

Click for more from BBC News.


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