The Massachusetts Department of Public Health on May 17 said it had confirmed a single case of monkeypox virus infection in a man who had recently traveled to Canada.

Health authorities around the world are investigating a mysterious increase in severe cases of hepatitis – inflammation of the liver – in young children.

Top U.S. infectious disease official Dr. Anthony Fauci said on March 22 he would not be surprised to see an increase in COVID-19 cases in the United States, but he does not expect a major surge.

Almost a third of people report at least one ongoing symptom between 6 and 12 months after their coronavirus infection, according to a survey of 152,000 people in Denmark.

Getting infected twice with two different Omicron coronavirus subvariants is possible, but rarely happens, a Danish study has found.

Johnson & Johnson during late 2021 quietly shut down the only plant making usable batches of the company’s COVID-19 vaccine, the New York Times reported, citing people familiar with the decision.

The BA.2 subvariant of the Omicron coronavirus variant, which has quickly taken over in Denmark, is more transmissible than the more common BA.1 and more able to infect vaccinated people, a Danish study found.

The prevailing theory about the Omicron variant is that it is going to rip through the population quickly and possibly burn out, marking the downside of the COVID-19 pandemic. But researchers are expressing concern about a subvariant of Omicron dubbed BA.2 that appears to be tearing through Denmark, just as the first Omicron wave subsided.

The BA.2 subtype of the Omicron coronavirus variant appears to have a substantial growth advantage over the currently predominant BA.1 type, Britain’s UK Health Security Agency said on Jan. 28.

The world’s first medical trial authorized to deliberately expose participants to the coronavirus is seeking more volunteers as it steps up efforts to help develop better vaccines.