Live tracker · Updated nightly

Cross-border virus spread, organized for the United States.

PublicHealthAlert ingests outbreaks, travel advisories, and imported cases from CDC, WHO, PAHO, ECDC, and Africa CDC — normalized into one reverse-chronological feed so you can answer: what started abroad and now has a U.S. link?

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This week

Activity from the last seven days, grouped by virus, country, and source.
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Trending viruses

    Active countries

      Reporting sources

        Most recent signals

        Newest virus-tagged events across all sources, regardless of region.
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        Priority viruses

        The six pathogens this tracker watches first, with current event counts.
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        Where it’s happening

        Country-level signal density. Click into the full map for individual events.
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        Country density 1 2–4 5+