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,

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

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