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

H5N1, known as bird flu, has been found in San Mateo County this week, according to state and local health officials. San Mateo County officials said Thursday that bird flu was found in a stray cat in Half Moon Bay.

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,

Millions of egg-laying hens have been lost due to the bird flu, causing egg production to slow and prices to skyrocket

Egg prices are soaring in the U.S., and the reason goes beyond simple inflation. A massive outbreak of bird flu has wiped out millions of egg-laying hens, creating shortages and raising concerns far beyond grocery store shelves.