New York Times
Newer variants of the coronavirus like Alpha and Delta are highly contagious, infecting far more people than the original virus. Two new studies offer a possible explanation: The virus is evolving to spread more efficiently through air.
The realization that the coronavirus is airborne indoors transformed efforts to contain the pandemic last year, igniting fiery debates about masks, social distancing and ventilation in public spaces.
Most researchers now agree that the coronavirus is mostly transmitted through large droplets that quickly sink to the floor and through much smaller ones, called aerosols, that can float over longer distances indoors and settle directly into the lungs, where the virus is most harmful.
The new studies don’t fundamentally change that view. But the findings signal the need for better masks in some situations, and indicate that the virus is changing in ways that make it more formidable.
“This is not an Armageddon scenario,” said Vincent Munster, a virologist at the National Institute of Allergy and Infectious Diseases, who led one of the new studies. “It is like a modification of the virus to more efficient transmission, which is something I think we all kind of expected, and we now see it happening in real time.”
Dr. Munster’s team showed that small aerosols traveled much longer distances than larger droplets and the Alpha variant was much more likely to cause new infections via aerosol transmission. The second study found that people infected with Alpha exhaled about 43 times more virus into tiny aerosols than those infected with older variants.
The studies compared the Alpha variant with the original virus or other older variants. But the results may also explain why the Delta variant is so contagious – and why it displaced all other versions of the virus.
“It really indicates that the virus is evolving to become more efficient at transmitting through the air,” said Linsey Marr, an expert in airborne viruses at Virginia Tech who was not involved in either study. “I wouldn’t be surprised if, with Delta, that factor were even higher.”
The ultratransmissibility of the variants may come down to a mix of factors. It may be that lower doses of the variants are required for infection, or that the variants replicate faster, or that more of the variant virus is exhaled into aerosols – or all three.
Newer variants of the coronavirus like Alpha and Delta are highly contagious, infecting far more people than the original virus. Two new studies offer a possible explanation: The virus is evolving to spread more efficiently through air.
The realization that the coronavirus is airborne indoors transformed efforts to contain the pandemic last year, igniting fiery debates about masks, social distancing and ventilation in public spaces.
Most researchers now agree that the coronavirus is mostly transmitted through large droplets that quickly sink to the floor and through much smaller ones, called aerosols, that can float over longer distances indoors and settle directly into the lungs, where the virus is most harmful.
The new studies don’t fundamentally change that view. But the findings signal the need for better masks in some situations, and indicate that the virus is changing in ways that make it more formidable.
“This is not an Armageddon scenario,” said Vincent Munster, a virologist at the National Institute of Allergy and Infectious Diseases, who led one of the new studies. “It is like a modification of the virus to more efficient transmission, which is something I think we all kind of expected, and we now see it happening in real time.”
Dr. Munster’s team showed that small aerosols traveled much longer distances than larger droplets and the Alpha variant was much more likely to cause new infections via aerosol transmission. The second study found that people infected with Alpha exhaled about 43 times more virus into tiny aerosols than those infected with older variants.
The studies compared the Alpha variant with the original virus or other older variants. But the results may also explain why the Delta variant is so contagious – and why it displaced all other versions of the virus.
“It really indicates that the virus is evolving to become more efficient at transmitting through the air,” said Linsey Marr, an expert in airborne viruses at Virginia Tech who was not involved in either study. “I wouldn’t be surprised if, with Delta, that factor were even higher.”
The ultratransmissibility of the variants may come down to a mix of factors. It may be that lower doses of the variants are required for infection, or that the variants replicate faster, or that more of the variant virus is exhaled into aerosols – or all three.
To read entire story, click on link: https://www.nytimes.com/2021/10/01/health/coronavirus-aerosols-airborne.html
3 comments:
Fear Porn
@ October 5, 2021 at 6:28 AM
100% correct!
The Alpha is not a variant, it is the SARS-2 virus. The rest are variants, which have been here since 2019-2020 (with some exceptions). It has been airborne since the beginning. You are more protected if you recovered from the Alpha strain than receiving any of the vaccines.
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