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Some People Are Mosquito Magnets – It Could Be the Soap They’re Using

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By Akshay Bandre

Why some people are mosquito magnets might be due to which soap they use in the shower, according to new research, as the pesky insects fly towards or away from specific aromas.

“It’s remarkable the same individual that is extremely attractive to mosquitoes when they are unwashed can be turned even more attractive to mosquitoes with one soap,” said senior author Dr. Clement Vinauger. “Then, they become repellent or repulsive to mosquitoes with another soap.”

The results of the team’s experiments found that washing with Dove and Simple Truth increased the attractiveness of some of the volunteers, while the smell of the Native brand tended to deter the blood suckers, according to the team at Virginia Tech.

Commenting on the many theories for why some people attract mosquitoes while others get off bite-free, co-author Dr. Chloe Lahondere says it’s not easy to pinpoint a specific reason.

“Everybody smells different, even after the application of soap. Your physiological status, the way you live, what you eat, and the places you go all affect the way you smell.

“And soaps drastically change the way we smell, not only by adding chemicals, but also by causing variations in the emission of compounds that we are already naturally producing.”

A series of experiments found soaps did impact mosquitoes’ preferences. Chemicals emitted by four human volunteers were analyzed both before and an hour after they’d applied body washes by Dial, Dove, Native, and Simple Truth (see the specific types below). Odor profiles of the soaps themselves were also broken down by chemical.

Choose a coconut-scented soap

Each participant emitted their own unique odor, some of which were more attractive to mosquitoes than others. Soap-washing significantly changed these—and not only by adding floral fragrances to the mix.

Effects of exhaled carbon dioxide (CO2), another important cue for mosquitoes, were excluded by conducting tests on fabric that had absorbed the participants’ odors.

Humans can’t smell CO2, which we and other animals exhale with each breath. Mosquitoes can. It boosts females’ activity, making them explore surrounding space in search of a host.

“All of the soaps contained a chemical called limonene which is a known mosquito repellent but in spite of that being the main chemical in all four soaps, three out of the four soaps we tested increased mosquitoes’ attraction,” said Dr. Vinauger.

The study published in iScience identified four chemicals associated with mosquito attraction. Three chemicals repulsed the mosquito, including a coconut-scent in American Bourbon and a floral compound used to treat scabies and lice.

The two soaps advertised as more “natural” (Simple Truth and Native) tended to be less chemical-heavy soaps (e.g., lower abundance of saturated and unsaturated hydrocarbons, such as alkanes and alkenes) than Dial and Dove.

Four body washes were selected based on their brand popularity, and fragrance: 1) Dial Body Wash with Marula Oil, 2) Dove Deep Moisture Nourishing Body Wash 3) Simple Truth Organic Honey Blossom Baby Shampoo & Body Wash, and 4) Native Coconut and Vanilla Body wash.

Clement Vinauger / Virginia Tech

They were combined to create and test attractive and repellent odor blends, which had strong impacts on the preference of the insects from the Aedes aegypti species.

“With these mixtures, we eliminated all the noise in the signal by only including those chemicals that the statistics were telling us are important for attraction or repulsion,” said Vinauger.

However, the effect of soap applications on the proportion of landing observed was a function of the interaction between the soap and the volunteer. Specifically, fewer mosquitoes landed on either sleeve when volunteer 1 was washed with either Dial, Simple Truth, or Native soap, than when only their unwashed scent was presented.

“I would choose a coconut-scented soap if I wanted to reduce mosquito attraction.”

He now plans to expand the results and find some general patterns or rules by testing more soap varieties and many more people—and explore how soap impacts mosquito preference over a longer period of time.

“We’re very curious to look at the time course of the effect… if you take a shower in the morning, does it still matter to mosquitoes in the evening?”

 

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Canada to donate up to 200,000 vaccine doses to combat mpox outbreaks in Africa

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The Canadian government says it will donate up to 200,000 vaccine doses to fight the mpox outbreak in Congo and other African countries.

It says the donated doses of Imvamune will come from Canada’s existing supply and will not affect the country’s preparedness for mpox cases in this country.

Minister of Health Mark Holland says the donation “will help to protect those in the most affected regions of Africa and will help prevent further spread of the virus.”

Dr. Madhukar Pai, Canada research chair in epidemiology and global health, says although the donation is welcome, it is a very small portion of the estimated 10 million vaccine doses needed to control the outbreak.

Vaccine donations from wealthier countries have only recently started arriving in Africa, almost a month after the World Health Organization declared the mpox outbreak a public health emergency of international concern.

A few days after the declaration in August, Global Affairs Canada announced a contribution of $1 million for mpox surveillance, diagnostic tools, research and community awareness in Africa.

On Thursday, the Africa Centres for Disease Control and Prevention said mpox is still on the rise and that testing rates are “insufficient” across the continent.

Jason Kindrachuk, Canada research chair in emerging viruses at the University of Manitoba, said donating vaccines, in addition to supporting surveillance and diagnostic tests, is “massively important.”

But Kindrachuk, who has worked on the ground in Congo during the epidemic, also said that the international response to the mpox outbreak is “better late than never (but) better never late.”

“It would have been fantastic for us globally to not be in this position by having provided doses a much, much longer time prior than when we are,” he said, noting that the outbreak of clade I mpox in Congo started in early 2023.

Clade II mpox, endemic in regions of West Africa, came to the world’s attention even earlier — in 2022 — as that strain of virus spread to other countries, including Canada.

Two doses are recommended for mpox vaccination, so the donation may only benefit 100,000 people, Pai said.

Pai questioned whether Canada is contributing enough, as the federal government hasn’t said what percentage of its mpox vaccine stockpile it is donating.

“Small donations are simply not going to help end this crisis. We need to show greater solidarity and support,” he said in an email.

“That is the biggest lesson from the COVID-19 pandemic — our collective safety is tied with that of other nations.”

This report by The Canadian Press was first published Sept. 13, 2024.

Canadian Press health coverage receives support through a partnership with the Canadian Medical Association. CP is solely responsible for this content.

The Canadian Press. All rights reserved.

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How many Nova Scotians are on the doctor wait-list? Number hit 160,000 in June

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HALIFAX – The Nova Scotia government says it could be months before it reveals how many people are on the wait-list for a family doctor.

The head of the province’s health authority told reporters Wednesday that the government won’t release updated data until the 160,000 people who were on the wait-list in June are contacted to verify whether they still need primary care.

Karen Oldfield said Nova Scotia Health is working on validating the primary care wait-list data before posting new numbers, and that work may take a matter of months. The most recent public wait-list figures are from June 1, when 160,234 people, or about 16 per cent of the population, were on it.

“It’s going to take time to make 160,000 calls,” Oldfield said. “We are not talking weeks, we are talking months.”

The interim CEO and president of Nova Scotia Health said people on the list are being asked where they live, whether they still need a family doctor, and to give an update on their health.

A spokesperson with the province’s Health Department says the government and its health authority are “working hard” to turn the wait-list registry into a useful tool, adding that the data will be shared once it is validated.

Nova Scotia’s NDP are calling on Premier Tim Houston to immediately release statistics on how many people are looking for a family doctor. On Tuesday, the NDP introduced a bill that would require the health minister to make the number public every month.

“It is unacceptable for the list to be more than three months out of date,” NDP Leader Claudia Chender said Tuesday.

Chender said releasing this data regularly is vital so Nova Scotians can track the government’s progress on its main 2021 campaign promise: fixing health care.

The number of people in need of a family doctor has more than doubled between the 2021 summer election campaign and June 2024. Since September 2021 about 300 doctors have been added to the provincial health system, the Health Department said.

“We’ll know if Tim Houston is keeping his 2021 election promise to fix health care when Nova Scotians are attached to primary care,” Chender said.

This report by The Canadian Press was first published Sept. 11, 2024.

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Newfoundland and Labrador monitoring rise in whooping cough cases: medical officer

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ST. JOHN’S, N.L. – Newfoundland and Labrador‘s chief medical officer is monitoring the rise of whooping cough infections across the province as cases of the highly contagious disease continue to grow across Canada.

Dr. Janice Fitzgerald says that so far this year, the province has recorded 230 confirmed cases of the vaccine-preventable respiratory tract infection, also known as pertussis.

Late last month, Quebec reported more than 11,000 cases during the same time period, while Ontario counted 470 cases, well above the five-year average of 98. In Quebec, the majority of patients are between the ages of 10 and 14.

Meanwhile, New Brunswick has declared a whooping cough outbreak across the province. A total of 141 cases were reported by last month, exceeding the five-year average of 34.

The disease can lead to severe complications among vulnerable populations including infants, who are at the highest risk of suffering from complications like pneumonia and seizures. Symptoms may start with a runny nose, mild fever and cough, then progress to severe coughing accompanied by a distinctive “whooping” sound during inhalation.

“The public, especially pregnant people and those in close contact with infants, are encouraged to be aware of symptoms related to pertussis and to ensure vaccinations are up to date,” Newfoundland and Labrador’s Health Department said in a statement.

Whooping cough can be treated with antibiotics, but vaccination is the most effective way to control the spread of the disease. As a result, the province has expanded immunization efforts this school year. While booster doses are already offered in Grade 9, the vaccine is now being offered to Grade 8 students as well.

Public health officials say whooping cough is a cyclical disease that increases every two to five or six years.

Meanwhile, New Brunswick’s acting chief medical officer of health expects the current case count to get worse before tapering off.

A rise in whooping cough cases has also been reported in the United States and elsewhere. The Pan American Health Organization issued an alert in July encouraging countries to ramp up their surveillance and vaccination coverage.

This report by The Canadian Press was first published Sept. 10, 2024.

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