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Health
Outbreaks, vaccines and seasonal health guidance from the sources that set it.
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2026–2027 flu season: vaccine composition and projected supply
This year's trivalent shots target A/Missouri (H1N1), A/Darwin (H3N2) and B/Victoria — up to 135 million doses planned.
CDC
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2026–27 flu, COVID-19 and RSV vaccine recommendations
Who needs what this season — including the newly approved mRNA flu vaccine for adults 50 and older.
Johns Hopkins Medicine
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CDC reports 4,410 measles cases as outbreak grows
Up 330 cases in a single week, with 451 hospitalizations. Pennsylvania's outbreak is the nation's largest at 1,222 cases, New York has declared a disaster emergency, and the WHO reviews the US measles elimination status next month.
Reuters