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The detection, found through routine milk testing, brings the number of states with infected dairy herds to 21 and follows Washington's first cases in October.

In past cases, the FDA has cited testing that matched the E coli strain that sickened a hospitalized child to unopened Darwin’s dog food and linked the company’s food to a kitten’s death from Salmonella infection. The cases are part of a yearslong record of recalls, illness reports, and disputes over how the agency regulates raw pet food.

The agency says the manufacturer, Arrow Reliance, has not adequately recalled the frozen food, which carries no expiration date and may still be in owners’ freezers.