Amesh A. Adalja, MD

WHO said Friday that the COVID-19 pandemic no longer constitutes a global public health emergency of international concern, citing reduced risks to human health driven by high population-level immunity and vaccination.

The White House announced that it will end COVID-19 vaccine requirements for federal employees and international air travelers on May 11, the same day the public health and national emergencies for the pandemic are scheduled to end.

Real-world data showed that bivalent messenger RNA vaccines against SARS-CoV-2 provided “significant additional protection” against symptomatic COVID-19 among people who had received two, three or four previous monovalent doses.

The CDC’s updated COVID-19 guidelines relax previous strategies and no longer require unvaccinated individuals to quarantine after an exposure.

The Biden administration on Tuesday confirmed that it has had discussions about making second COVID-19 booster shots available to all U.S. adults amid a surge in infections driven by the omicron BA.5 subvariant.

An FDA advisory committee on Tuesday recommended that Novavax’s two-dose COVID-19 vaccine be made available in the United States under an emergency use authorization.

LISBON, Portugal — A study conducted among health care workers in the United Kingdom demonstrated that longer intervals between COVID-19 vaccine doses produced higher antibody levels, researchers reported here.

A federal judge in Florida overturned the CDC’s national mask mandate for public transportation — including on airplanes and trains — saying in her order that it was “unlawful.”

In this video, Amesh A. Adalja, MD, a senior scholar in the Johns Hopkins Center for Health Security, describes his experiences during the first months of the COVID-19 pandemic in 2020.

Pfizer and BioNTech announced this week that they are seeking an emergency use authorization from the FDA for an additional booster dose of their COVID-19 vaccine for older adults.