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Pfizer, Moderna COVID-19 vaccines effective against variant first associated with New York, studies find
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A new bird flu jumps to humans but it s not a problem -- so far
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When scientists began working on solutions for the COVID-19 pandemic in early 2020, it seemed unlikely that a safe and effective vaccine would be available in a year, according to
Paul A. Offit, MD.
Yet, by mid-December, the FDA had authorized two messenger RNA (mRNA) vaccines developed by Pfizer-BioNTech and Moderna for emergency use after researchers found they were more than 90% efficacious in late-stage trials data now backed up by real-world evidence.
The authorities quickly tested the birds and moved into high gear, killing 800,000 chickens, disposing of the carcasses and cleaning the farm to stop the potential spread to other chicken farms. But they were also concerned for humans.
They tested the birds and sequenced the virus, determining that it was the H5N8 strain of avian flu, highly dangerous to both wild and domestic birds. It is established in Asia and has been increasingly causing deadly outbreaks in birds in Europe. H5N8 viruses have infected some poultry flocks in the United States, but the viruses come from a different though related lineage of virus, distinct from the current H5N8 viruses in Asia and Europe. Flu viruses combine and mutate frequently in unpredictable ways.
We know a lot about Covid-19. Experts have many more questions A transmission electron micrograph of a SARS-CoV-2 virus particle.
NIAID
Less than a year and a half ago, the world was blissfully, dangerously ignorant of the existence of a coronavirus that would soon turn life on earth on its head.
In the 16 months since the SARS-CoV-2 virus burst into the global consciousness, we’ve learned much about this new health threat. People who contract the virus are infectious before they develop symptoms and are most infectious early in their illness. Getting the public to wear masks, even homemade ones, can reduce transmission. Vaccines can be developed, tested, and put into use within months. As they say, where there’s a will, there’s a way.
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