San Mateo County public health officials reported finding H5N1 bird flu in a pet cat and a backyard poultry flock.

Authorities in San Mateo County are asking people to take precautions after two cases of bird flu were detected there. The first case was in a backyard poultry flock in the city of San Mateo. Then, most recently,

The discovery of bird flu in the San Mateo backyard flock prompted health officials to remind people to take biosecurity measures.