Manal Mohammed is a senior lecturer of medical microbiology at the University of Westminster. Since the COVID variant Omicron emerged in late 2021, it has rapidly evolved into multiple subvariants.

Editor’s note: This story has been updated with the latest information after updated omicron booster shots from Pfizer and Moderna were authorized by the FDA on Aug. 31, 2022 and later recommended by ...

People may assume that a COVID-19 infection protects them the next time they encounter the virus, but that's not necessarily true. A new study of 750 vaccinated seniors living in retirement homes and ...

Recent analyses show that Omicron variants of SARS-CoV-2 more strongly suppress major histocompatibility complex class I expression than previous versions of the virus. Throughout the pandemic, the ...

In a study published in JAMA Network Open today, scientists report on how effective the original vaccine and booster shots are against the COVID-19 Delta and Omicron variants. Researchers in Ontario ...

The fast-spreading BA.5 subvariant of Omicron and its close relative BA.4 now make up around 95% of COVID-19 cases in the U.S., according to estimates published Tuesday by the Centers for Disease ...