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COVID-19 can remain infectious on bank notes, other surfaces for weeks: study

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TORONTO —
A new study looking at how long the novel coronavirus can survive on surfaces found that it can remain infectious on some surfaces — including bank notes — for at least 28 days, provided the temperature is right.

Published this week in the Virology Journal, the new paper describes how researchers tested the virus on several surfaces, including cotton and bank notes, at numerous temperatures in order to measure the lifespan of the virus under these different circumstances.

They found that the virus dies significantly faster on surfaces in hotter temperatures, and can survive on several non-porous surfaces for up to four weeks — much longer than previous studies have indicated.

Overwhelmingly, evidence has shown that the primary way COVID-19 is spread is through droplets and through sharing air with others, but that hasn’t stopped the fear of surface transmission. Hand washing is still one of the most important prevention methods that health officials tout.

Previous studies have looked at how long SARS-CoV-2, the virus that causes COVID-19, remains infectious on different surfaces, with some studies finding it to be a matter of hours, and others saying it could be days.

In this study, the surfaces researchers tested the virus on included Australian bank notes — which, like Canadian bank notes, are polymer — paper bank notes, glass, vinyl, stainless steel and cotton.

Researchers noted that they wanted to include money because it is an object that travels frequently between different people. Stainless steel, vinyl and glass are materials found in most public spaces, and cotton is often found in clothing and bedding.

When a virus gets onto a surface, it is often through a sneeze or through droplets expelled from the mouth. Researchers diluted SARS-CoV-2 “in a defined organic matrix […] designed to mimic the composition of body secretions” before placing it onto the materials to measure the longevity.

They noted in the paper that the concentration of the virus in each sample was high, it still “represents a plausible amount of virus that may be deposited on a surface.”

Samples of each material with the virus on it were placed into a “humidified climate chamber” so a set humidity of 50 per cent relative humidity could be maintained while the samples were tested at different temperatures and timeframes.

Samples were tested at 20, 30 and 40 degrees Celsius, and were inspected 1 hour, 3 days, 7 days, 14 days, 21 days and 28 days after the virus had first been introduced to the material.

Researchers found that at 20 degrees Celsius, the virus could survive for at least 28 days on every material except for cotton, the most porous of the materials tested.

SARS-CoV-2 couldn’t be detected on cotton after 14 days had passed.

“The majority of virus reduction on cotton occurred very soon after application of virus, suggesting an immediate absorption effect,” the report said.

Does this mean every bank note in our wallets could infect us? According to Colin Furness, an infection control epidemiologist at the University of Toronto, we shouldn’t jump straight to alarm.

“What we’re seeing empirically, clinically, with contact tracing, is that COVID is not spreading heavily through touch,” he said.

It is possible to contract the virus through surfaces, he said, “but it’s not happening very often.”

He said that earlier in the pandemic, when we had a looser understanding of the virus, there was a bigger fear of things like groceries or the mail in terms of surface transmission. But at this point, we have a greater understanding of how COVID-19 predominantly spreads.

“It’s shared airspace,” Furness said. “It’s droplet and aerosols and shared air with poor ventilation and prolonged contact. That’s how you get sick. That’s the thing to be scared of, which is why I’ve been very, very worried about indoor dining. And it’s not because you might touch contaminated cutlery. It’s because you’re in this room with a lot of other people and not wearing a mask and sharing air.”

This study carried out its experiments at a lab at the Australian Centre for Disease Preparedness, with the samples in complete darkness “to negate any effects of UV light” — just one way that the conditions of the experiments differed from real life.

“[This study] tells you what can happen under laboratory conditions,” Furness said.

A bank note in your pocket or your wallet is rubbing up against other things, he explained, not sitting undisturbed to measure the longevity of a virus. If surfaces are exposed to sunlight as well, that can aid with a faster decay of any virus on the surface.

These studies are the first step, he said, and then researchers “need to test in the real world. What is the real significance of this?

“And those numbers are usually quite different.”

The raw numbers of the study also don’t paint the full picture. Although the virus was still detectable on most surfaces at the 28 day mark, it reduced in concentration much faster than that.

“Viruses aren’t alive,” Furness said. “They can’t regenerate, they can’t metabolize or protect themselves as soon as they leave your body. As soon as you exhale some virus, the virus starts to die.”

The half-life of the virus (the time it takes for it to reduce by 50 per cent) on a paper bank note at 20 degrees Celsius was 2.74 days, showing the viral load decreases in concentration far faster than the 28 days would suggest. After 9.13 days, 90 per cent of the virus was gone.

On cotton, at 20 degrees Celsius, the half-life was 1.68 days, and it took 5.57 days for a 90 per cent reduction in the virus.

Five to nine days is still a long time for a virus to remain infectious on a surface, although it’s still unknown at what point the viral load would be too small to actually make a person ill.

Researchers said in the paper that the extended half-life in this study compared to others could be down to the controlled conditions that they created for the experiment.

While this study does not mean we should panic about surface transmission, which remains one of the rarer ways to transmit the virus, it does provide insight into how temperature interacts with the virus’ survivability.

Researchers did not measure any of the virus samples at less than 20 degrees Celsius, but they observed how much the rate of virus decline sped up when the temperature increased from 30 to 40 degrees Celsius. Extrapolating backwards from that, they posit that if the temperature dropped significantly from 20 degrees Celsius, the lifespan of the virus on various surfaces could increase.

“This data could therefore provide a reasonable explanation for the outbreaks of COVID-19 surrounding meat processing and cold storage facilities,” they theorize.

Furness said the temperature is a huge factor when it comes to a virus’ survivability.

“In the winter, in freezing temperatures, COVID will last [longer] on surfaces,” he said.

“So if you’re going to a playground in the winter, it can be quite worrisome. I wonder whether we’re going to see that COVID does spread more by touch in the winter. I can’t say that it does, but it’s entirely possible that it will.”

He said the concept of temperature is something that hasn’t been emphasized enough as Canada begins to tackle its second wave.

“It’s not just the numbers are going up,” he said. “Numbers are going up, while temperatures are going down.”

The best thing to do?

“We should continue to wash our hands and be vigilant,” Furness said. “In fact, during COVID, I would say the best outcome of washing your hands is actually so you don’t get any other colds that would make you afraid that maybe you have COVID.”

Source: – CTV News

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Women in states with bans are getting abortions at similar rates as under Roe, report says

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Women living in states with abortion bans obtained the procedure in the second half of 2023 at about the same rate as before the U.S. Supreme Court overturned Roe v. Wade, according to a report released Tuesday.

Women did so by traveling out of state or by having prescription abortion pills mailed to them, according to the #WeCount report from the Society of Family Planning, which advocates for abortion access. They increasingly used telehealth, the report found, as medical providers in states with laws intended to protection them from prosecution in other states used online appointments to prescribe abortion pills.

“The abortion bans are not eliminating the need for abortion,” said Ushma Upadhyay, a University of California, San Francisco public health social scientist and a co-chair of the #WeCount survey. “People are jumping over these hurdles because they have to.”

Abortion patterns have shifted

The #WeCount report began surveying abortion providers across the country monthly just before Roe was overturned, creating a snapshot of abortion trends. In some states, a portion of the data is estimated. The effort makes data public with less than a six-month lag, giving a picture of trends far faster than the U.S. Centers for Disease Control and Prevention, whose most recent annual report covers abortion in 2021.

The report has chronicled quick shifts since the Supreme Court’s Dobbs v. Jackson Women’s Health Organization ruling that ended the national right to abortion and opened the door to enforcement of state bans.

The number of abortions in states with bans at all stages of pregnancy fell to near zero. It also plummeted in states where bans kick in around six weeks of pregnancy, which is before many women know they’re pregnant.

But the nationwide total has been about the same or above the level from before the ruling. The study estimates 99,000 abortions occurred each month in the first half of 2024, up from the 81,000 monthly from April through December 2022 and 88,000 in 2023.

One reason is telehealth, which got a boost when some Democratic-controlled states last year began implementing laws to protect prescribers. In April 2022, about 1 in 25 abortions were from pills prescribed via telehealth, the report found. In June 2024, it was 1 in 5.

The newest report is the first time #WeCount has broken down state-by-state numbers for abortion pill prescriptions. About half the telehealth abortion pill prescriptions now go to patients in states with abortion bans or restrictions on telehealth abortion prescriptions.

In the second half of last year, the pills were sent to about 2,800 women each month in Texas, more than 1,500 in Mississippi and nearly 800 in Missouri, for instance.

Travel is still the main means of access for women in states with bans

Data from another group, the Guttmacher Institute, shows that women in states with bans still rely mostly on travel to get abortions.

By combining results of the two surveys and comparing them with Guttmacher’s counts of in-person abortions from 2020, #WeCount found women in states with bans throughout pregnancy were getting abortions in similar numbers as they were in 2020. The numbers do not account for pills obtained from outside the medical system in the earlier period, when those prescriptions most often came from abroad. They also do not tally people who received pills but did not use them.

West Virginia women, for example, obtained nearly 220 abortions monthly in the second half of 2023, mostly by traveling — more than in 2020, when they received about 140 a month. For Louisiana residents, the monthly abortion numbers were about the same, with just under 700 from July through December 2023, mostly through shield laws, and 635 in 2020. However, Oklahoma residents obtained fewer abortions in 2023, with the monthly number falling to under 470 from about 690 in 2020.

Telehealth providers emerged quickly

One of the major providers of the telehealth pills is the Massachusetts Abortion Access Project. Cofounder Angel Foster said the group prescribed to about 500 patients a month, mostly in states with bans, from its September 2023 launch through last month.

The group charged $250 per person while allowing people to pay less if they couldn’t afford that. Starting this month, with the help of grant funding that pays operating costs, it’s trying a different approach: Setting the price at $5 but letting patients know they’d appreciate more for those who can pay it. Foster said the group is on track to provide 1,500 to 2,000 abortions monthly with the new model.

Foster called the Supreme Court’s 2020 decision “a human rights and social justice catastrophe” while also saying that “there’s an irony in what’s happened in the post-Dobbs landscape.”

“In some places abortion care is more accessible and affordable than it was,” she said.

There have no major legal challenges of shield laws so far, but abortion opponents have tried to get one of the main pills removed from the market. Earlier this year, the U.S. Supreme Court unanimously preserved access to the drug, mifepristone, while finding that a group of anti-abortion doctors and organizations did not have the legal right to challenge the 2000 federal approval of the drug.

This month, three states asked a judge for permission to file a lawsuit aimed at rolling back federal decisions that allowed easier access to the pill — including through telehealth.

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How many smoke-related deaths from wildfires are linked to climate change every year?

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Climate change may be contributing to thousands more wildfire smoke-related deaths every year than in previous decades, a new study suggests — results a Canadian co-author says underline the urgency of reducing planet-warming emissions.

The international study published Monday is one of the most rigorous yet in determining just how much climate change can be linked to wildfire smoke deaths around the world, said Sian Kou-Giesbrecht, an assistant professor at Dalhousie University.

“What stands out to me is that this proportion is increasing just so much. I think that it really kind of attests to just how much we need to take targeted action to reducing greenhouse-gas emissions,” she said in an interview.

The study estimates, using mathematical modeling, that about 12,566 annual wildfire smoke-related deaths in the 2010s were linked to climate change, up from about 669 in the 1960s, when far less carbon dioxide was concentrated in the atmosphere.

Translated to a proportion of wildfire smoke mortality overall, the study estimates about 13 per cent of estimated excessdeaths in the 2010s were linked to climate change, compared to about 1.2 per cent in the 1960s.

“Adapting to the critical health impacts of fires is required,” read the study, published in the peer-reviewed journal Nature Climate Change.

While wildfires are a natural part of the boreal forest ecosystem, a growing number of studies have documented how climate change, driven by the burning of fossil fuels, is making them larger and more intense — and contributing more to air pollution.

The same research group is behind another study published in the same journal Monday that suggests climate change increased the global area burned by wildfire by about 16 per cent from 2003 to 2019.

Those climate-fuelled fires then churn out more fine particle pollution, known as PM2.5, that’s tiny enough to get deep into the lungs — and in the long run can have serious health effects.

The study that estimated the scale of those effects is based on modeling, not historical data about reported deaths from air pollution.

Researchers used established public-health metrics for when pollution is thought to contribute to mortality, then figured out the extent to which wildfire smoke may have played a role in that overall exposure to arrive at the estimates.

Meanwhile, Health Canada estimates that between 2013 and 2018, up to 240 Canadians died every year due to short-term exposure to wildfire air pollution.

Kou-Giesbrecht said Monday’s study did not find that climate change had a major influence on the number of smoke-related deaths from Canada’s boreal wildfires.

She suggested that’s likely due to the country’s relatively small population size, and how tricky it is to model forest fires in the region, given its unique mix of shrubs and peat.

But she also noted that a stretch of devastating Canadian wildfire seasons over the past several years was not captured in the study, and she expects future research could find a bigger increase in deaths and public-health problems linked to climate change.

The most affected regions in the study were South America, Australia and Europe.

Kou-Giesbrecht said the more studies that uncover the link between climate change and disasters as “tangible” as wildfires, the more the case for “drastic climate action” will be bolstered.

“I think that the more and more evidence that we have to support the role of climate change in shaping the past 100 years, and knowing that it will continue to shape the next 100 years, is really important,” she said.

“And I find that personally interesting, albeit scary.”

The study used three highly complex models to estimate the relationship between climate change, land use and fire.

The models, which each contain thousands upon thousands of equations, compare what wildfires look like in the current climate to what they may have looked like in pre-industrial times, before humans started to burn vast amounts of fossil fuels.

The researchers used the models to calculate gas and aerosol emissions from wildfires between 1960 and 2019, and then make estimates about annual smoke-related deaths.

The type of methodology used by Monday’s studies, known as attribution science, is considered one of the fastest-growing fields of climate science. It is bolstered in part by major strides in computing power.

This report by The Canadian Press was first published Oct. 21, 2024.

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Some Ontario docs now offering RSV shot to infants with Quebec rollout set for Nov.

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Some Ontario doctors have started offering a free shot that can protect babies from respiratory syncytial virus while Quebec will begin its immunization program next month.

The new shot called Nirsevimab gives babies antibodies that provide passive immunity to RSV, a major cause of serious lower respiratory tract infections for infants and seniors, which can cause bronchiolitis or pneumonia.

Ontario’s ministry of health says the shot is already available at some doctor’s offices in Ontario with the province’s remaining supply set to arrive by the end of the month.

Quebec will begin administering the shots on Nov. 4 to babies born in hospitals and delivery centers.

Parents in Quebec with babies under six months or those who are older but more vulnerable to infection can also book immunization appointments online.

The injection will be available in Nunavut and Yukon this fall and winter, though administration start dates have not yet been announced.

This report by The Canadian Press was first published Oct. 21, 2024.

-With files from Nicole Ireland

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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