California flu test rate at 9. 65%, higher than normal 1% rate for early October, amid mutation of H1N1 influenza A strain Flu cases on the west coast are on the rise months earlier than normal, prompting US health experts to stress the importance of the annual vaccine. Flu activity typically ra...
Source: [Guardian World](https://www.theguardian.com/us-news/2026/oct/22/flu-cases-west-coast-cdc)