A recent preprint suggesting SARS-CoV-2 came from a lab has reignited the fierce debate over the origins of the virus.

A team led by investigators at Massachusetts General Hospital has determined that Omicron BA.2 is weaker than both Delta and the original Omicron variant.

A new study finds that misdirected immune responses can persist for months in those who are suffering from long COVID-19.

Reductions in surgical procedures precipitated by SARS-CoV-2 have not fully returned to their pre-pandemic levels, resulting in severe backlogs and deferred surgeries.

According to a letter from Biden’s doctor, the president has a runny nose, mild fatigue and a slight cough. The letter also noted that Biden began taking an antiviral drug the morning he tested positive.

The FDA’s authorization of COVID-19 shots for children ages 6 months to 4 years will bring relief for millions of parents. Pending CDC endorsement, shots for this group will be available within days.

The COVID-19 vaccines continue to be effective against severe illness leading to hospitalization and death in all age groups, including children ages 5 to 11.

Harvard T.H. Chan School of Public Health Professor William Hanage explains how to stay on guard against subvariants, noting role of protective measures in transition to new pandemic phase.

With the relaxation of mask-wearing mandates, there’s even more need to know how much over-the-counter tests help.

Your blood can hold a record of past illnesses. That information can reveal how many people have had a certain infection – like 58% of Americans having had COVID-19 by the end of February 2022.