- Rare bird flu strain found in California raises potential of wider spread The Washington Post
- How are H5N9 and H5N1 different? What to know after California bird flu outbreak CBS News
- Tests identify H5N9 avian flu at California duck farm University of Minnesota Twin Cities
- Bird flu cases are rising in the Bay Area. Here’s what you should know The Oaklandside
- Worrying bird flu strain undisclosed by US after Trump orders WHO exit Sydney Morning Herald
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