According to an investigation by the Los Angeles Times, dairy operators in the Central Valley of California are demonstrating gross neglect of worker safety. This follows evidence that bovine influenza-H5N1 is zoonotic albeit only producing conjunctivitis and mild upper respiratory symptoms. Most operators of dairy farms reviewed were not following CDC and state recommendations regarding protection.  Dairy operators should be aware of the need to provide personal protective equipment (PPE) and to instruct workers on their correct use and to ensure that workers are adequately protected.  At issue is the possibility of the virus undergoing mutation after infecting humans, resulting in a strain that is either more pathogenic or possibly becoming contagious.

The Centers for Disease Control and Prevention has demonstrated antibodies to H5N1 among dairy workers with or without symptoms, suggesting that infection may be more widespread among workers than was previously recognized.  Through the last week in November, a total of 689 dairy herds have been diagnosed with bovine influenza-H5N1 with 475 in California mainly in the Central Valley over the past three months.

Western United Dairies, a group representing producers, arranged a worker-safety workshop at the Tulare Expo Center during October to increase awareness of bovine influenza-H5N1 and the need for PPE.  Protection is especially important on farms where the infection has been confirmed by routine sampling of bulk milk. Workers should protect their eyes from contact with contaminated milk.  Dr. Erica Pan, State Epidemiologist for California, recommends correct use of PPE, updating seasonal influenza vaccination and refraining from consumption of raw milk and undercooked ground beef.