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HPAI found in Michigan dairy herd; disease traced to Texas
LANSING, Mich. — Avian Influenza has been found in a Michigan dairy herd. The announcement came March 29 from the Michigan Department of Agriculture and Rural Development (MDARD).  Director Tim Boring announced the detection of highly pathogenic avian influenza (HPAI) in a dairy herd from Montcalm County. The U.S. Department of Agriculture’s National Veterinary Services Laboratories has confirmed this detection.
Further testing and investigation by state and federal officials revealed the farm recently received cattle from an affected premises in Texas before that herd showed any sign of disease. When the cattle were moved from Texas to Michigan, the cattle were not symptomatic and did not appear ill. As this national situation continues to develop, it is essential for all producers to contact their veterinarian if they have any concerns regarding the health of their animals, regardless of species.
“We have well-trained staff responding to this situation and I have the utmost confidence in our team. We will continue working with our local, state, and national partners to protect animal and public health,” said Boring. “Our highest priorities at MDARD remain protecting our food supply and ensuring animal health. As this situation evolves, we will provide critical updates to producers, industry, and all Michiganders.”
“This case does reflect a lot of what is already known about this virus—namely, that it is highly contagious, it continues to be primarily spread by wild birds and contact with infected animals, and mammals can contract the virus,” said State Veterinarian Dr. Nora Wineland, DVM, MS, DACVPM. “MDARD is working diligently and in close collaboration with government partners, producer groups, and Michigan dairy farmers to address the situation and prevent the spread of disease. As more is learned, it is vitally important for producers to work with their veterinarian and isolate sick animals from others, minimize the number of visitors to their farms, prevent contact between their animals and wildlife, and continue to vigilantly monitor the health of their animals.”
HPAI is a highly contagious virus that can be spread directly by infected wild birds/animals or indirectly through any item that has been exposed to the virus—such as equipment, feed, or the clothing and shoes of caretakers. The virus has been detected in various species of mammals—presumably after the animals come into contact with infected birds. 
If cattle producers notice decreased lactation, low appetite, and/or other symptoms in their herds, please contact your veterinarian to determine the next appropriate steps to take.
Analysis of the virus from this case and the other cases of affected cattle has not shown any significant new adaptation to make the virus more transmissible between mammals. Therefore, the public health risk associated with HPAI remains low.
According to the Food and Drug Administration and Centers for Disease and Prevention, the commercial milk supply remains safe due to both federal animal health requirements and pasteurization.