Los Angeles Times The number of California dairy herds reported to have outbreaks of H5N1 bird flu has grown to eight.
Officials have refused to disclose the locations of the infected herds, but have said they are in close proximity somewhere in California’s Central Valley — an 18,000-square-mile expanse that is roughly the size of Vermont and New Hampshire combined.
They say they are still investigating the source of the virus, but at a news conference Thursday, federal officials said genetic sequencing from the first three outbreaks suggests the strain is similar to that seen in other states. They say it does not appear to have been caused by wild birds or animals.
“This is the same virus that we’ve detected in herds since the beginning of the emergence of H5N1 in dairy cows,” said Eric Deeble, deputy under secretary for marketing and regulatory programs at the United States Department of Agriculture. “Sequencing of the samples from the additional five premises will likely be completed later this week or over the weekend.”