Around 100 cases of Guillain-Barré have been reported in people who received the J&J vaccine.
Here's a look at the science behind SARS-CoV-2 variants and which coronavirus mutants are the most concerning in different areas.
So far, lambda has been detected in 29 countries, with high levels of spread in South American countries.
The Johnson & Johnson COVID-19 vaccine is highly effective against the highly transmissible delta variant, the company announced.
The mRNA vaccines will likely provide protection against the coronavirus for years if it doesn't evolve significantly, a small new study suggests.
Most countries that host laboratories dealing with the deadliest pathogens score low on measures of biosecurity and biosafety.
A highly transmissible SARS-CoV-2 variant called "delta" has spread to nearly 100 countries around the world, including to the U.S., where it's likely to soon become the dominant variant.
A researcher in Seattle has dug up deleted files from Google Cloud that reveal 13 partial genetic sequences for some of the earliest cases of COVID-19 in Wuhan.
If all the circulating SARS-CoV-2 particles were gathered together into one place, they would weigh somewhere between the weight of an apple and that of a young toddler.
Researchers in Israel say they've found a possible link between the Pfizer-BioNTech COVID-19 vaccine and cases of heart inflammation called myocarditis in young men.
Men with low testosterone levels may be more likely to have severe COVID-19, a small new study suggests.
The study is the first to follow children with the syndrome, called MIS-C, for as long as six months.