Diseases, Conditions, Syndromes

COVID-19 shots might be tweaked if variants get worse

The makers of COVID-19 vaccines are figuring out how to tweak their recipes against worrisome virus mutations—and regulators are looking to flu as a blueprint if and when the shots need an update.

Vaccination

Moderna says its low-dose COVID shots work for kids under 6

Moderna's COVID-19 vaccine works in babies, toddlers and preschoolers, the company announced Wednesday—a development that could pave the way for the littlest kids to be vaccinated by summer if regulators agree.

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