The H5N1 virus was found in a sample of unpasteurized milk at a store, prompting a recall of one batch. Health agencies have warned against the growing dietary fad.

Health officials in California are alerting consumers of a voluntary recall of a batch of cream top, whole milk that was produced by Raw Farms, LLC, in Fresno County after bird flu was detected in a sample.

The contaminated sample came from Fresno-based Raw Farm, the largest producer and retailer of raw dairy in California. The tainted sample was detected by officials from the Santa Clara County public health office, which has been testing raw milk already placed in retail stores across the state “as a second line of consumer protection.”