Diseases, Conditions, Syndromes

Two new Omicron subvariants gain ground in U.S.

The Omicron subvariants BA.4 and BA.5 are spreading rapidly in the United States, but it's not yet clear if they'll trigger a new wave of infections or a surge in hospitalizations and deaths, experts say.


COVID: How anti-vaccine influencers exploit mothers

Opposition to vaccination has existed for as long as vaccination itself. Ever since widespread smallpox vaccination began in the early 1800s, there have been cycles of questioning the safety and efficacy of particular vaccines.

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