A new strain of bird flu, different from the one that has affected U.S. herds since last year, has been found in dairy cattle in Nevada, according to Agriculture Department officials. This discovery suggests that distinct forms of the virus Type A H5N1 have crossed over from wild birds into cattle on at least two occasions, raising concerns about the spread and control of infections in animals and those who work closely with them.
The new version of the virus, known as D1.1, was confirmed in Nevada cattle recently, after being introduced to cattle in late 2023. This strain, along with the previously identified B3.13 version, has infected over 950 herds in 16 states. The detection of the new strain underscores the importance of ongoing surveillance and testing efforts.
Experts emphasize the significance of promptly sharing information about the virus to better understand its spread and potential impact. The U.S. Centers for Disease Control and Prevention reported that at least 67 individuals in the U.S. have been infected with bird flu, primarily individuals who work closely with dairy or cattle.
Scientists stress the need for transparency and collaboration in addressing the threat posed by the new strain of bird flu. The USDA plans to release genetic sequences and other data related to the virus to a public repository, which will be crucial in determining the timeline and extent of the spillover event.
Given the potential for a pandemic, experts warn that swift action is essential to safeguard national and global security, as well as the well-being of both humans and animals. The urgency of the situation is underscored by the severity of illness observed in cases linked to the new strain, including the first U.S. death associated with bird flu and a serious illness in Canada.
As the investigation into the new strain of bird flu continues, researchers and officials stress the importance of vigilance and collaboration to mitigate the risks posed by the virus and protect public health.
