Bird flu has been detected at four dairy farms in San Bernardino County, officials announced on Thursday, March 6.

According to a county news release, the risk of infection from H5N1, commonly known as bird flu, remains low. “No cases of person-to-person transmission have been reported in California.” County Health Officer Sharon Wang emphasized the importance of caution when handling animals or animal products, stating, “While the general public faces minimal risk, the presence of this virus on multiple farms highlights the need for preventive measures.” Officials advise farm workers to take extra precautions, such as frequent handwashing and wearing protective gear when handling animals.

Health officials explain that bird flu can spread from infected cows, birds, and other animals to humans through various means, including inhaling contaminated dust or droplets, touching the face with unwashed hands after contact with infected surfaces, handling sick or deceased animals, or consuming raw, unpasteurized milk and dairy products.

In January, Riverside County officials reported that a new strain of avian influenza had been detected at both dairy and poultry farms, prompting health authorities to urge heightened precautionary measures.

At that time, the Riverside County Department of Public Health confirmed positive cases in animals at 25 egg and dairy production sites, including a backyard chicken coop.

Health officials note that symptoms typically develop within two to eight days and may include red eyes, cough, sore throat, nasal congestion, diarrhea, vomiting, headaches, fatigue, fever, and, in some cases, difficulty breathing.