By Lena H. Sun, The Washington PostDairy cattle feed at a farm in New Mexico on March 31, 2017. A fourth dairy worker in the U.S. has been infected with bird flu.
The Colorado Department of Public Health and Environment said in a statement that the man was given antiviral medication and recovered. He works at a dairy farm in northeast Colorado and had direct exposure to dairy cattle infected with H5N1, a virus that causes bird flu. No household contacts of the farmworker have developed symptoms and there is no evidence of person-to-person transmission, Herlihy said. State and local health officials are conducting follow-up investigations and will do additional testing if needed, Herlihy said.
Federal health and agriculture officials have repeatedly underscored the importance of dairy farm owners ensuring that workers take precautions - such as wearing personal protective equipment - when working with infected cattle. Federal and state officials have made supplies available to dairy farms but have not required their use.
A recent Department of Agriculture study of H5N1 in 15 dairy herds and eight poultry flocks in Michigan found three risk factors for local spread, including contaminated equipment or machinery, people who carry the virus on their clothing or boots, and the animals themselves.
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