Three bovine veterinarians had undetected H5N1 avian influenza infections despite no apparent contact with infected cows, suggesting that there may be U.S. states with unidentified positive cases of bird flu,

Dr. Angela Rasmussen, a virologist and professor at the University of Saskatchewan, told "The Gee and Ursula Show" on KIRO Newsradio that fewer people have gotten the flu vaccine this season.

Ongoing bird flu outbreaks continue to ravage commercial poultry flocks in Indiana and Ohio, where two counties issued emergency declarations last week. But Tennessee appears to be faring better, at least for now.

The study provides growing evidence of the threat it poses even when cats have no direct exposure to sick dairy cows or poultry.

Amid rising respiratory illnesses, a CDC report reveals undetected bird flu cases in US veterinarians. The spread, shown through antibody tests, indicates infections occurring beyond known zones. Experimental confirmation of H5N1 transmission through cow milk prompts officials to urge all states to join the national milk testing program.

The report is the latest evidence that the outbreak in dairy herds is spreading undetected in cows, and the spillover into people at highest risk of exposure is going unnoticed.

A new Centers for Disease Control and Prevention study suggests that bird flu may be spreading under the radar in the U.S. In September, the CDC tested 150 veterinarians who primarily worked with cattle in the past three months.

Matha, in Quebec’s Lanaudière region, is dealing with an avian flu outbreak. It was first detected on Jan. 31 A primary control zone has been established around the area to limit the risk of avian influenza spreading.

The study, “Seroprevalence of Highly Pathogenic Avian Influenza A (H5) Virus Infections Among Bovine Veterinary Practitioners,” aimed to investigate the prevalence of recent H5N1 infection among bovine veterinary practitioners in the US.

A dead wild bird in Hays County tested positive for bird flu, prompting health officials to monitor the situation closely.

Vaxitek HVT+IBD+H5 integrates COBRA technology to address the ongoing viral evolution challenges of avian influenza, as well as for the prevention of Marek disease and infectious bursal disease.

The Public Health Agency of Canada said Wednesday it's purchased 500,000 doses of a human vaccine to protect against avian influenza for those most at risk from being exposed to the virus by infected animals.