CDC calls for more bird flu testing for Michigan farmworkers

By Andi Anderson

The Centers for Disease Control and Prevention (CDC) has issued new guidance calling for expanded testing of Michigan farmworkers who have been in close contact with animals infected with bird flu.

This move comes after recent studies revealed that some farmworkers tested positive for the H5N1 virus without showing any symptoms.

In a study conducted by the CDC, blood tests for 115 farmworkers in Michigan and Colorado found that eight individuals, including four from Michigan, had antibodies for the H5N1 virus.

This discovery has raised concerns about the potential for the virus to spread undetected among those working with infected animals.

“The goal of this new guidance is to protect farmworkers and limit the risk of transmission to humans,” said Dr. Nirav Shah, principal director at the CDC. The updated guidance emphasizes testing and providing treatment to farmworkers even if they are asymptomatic.

Previously, the CDC recommended testing only for symptomatic workers. This new guidance reflects concerns that the H5N1 virus, first detected in Michigan dairy cows in March, may pose a greater risk than initially assessed.

High levels of the virus have been found in milk from infected cows, raising the possibility of further exposure.

Experts, including Dr. Gregory Gray from the University of Texas, commend this move, stating that it recognizes the serious risks posed by H5N1. “This is a necessary shift, as these viruses may be more dangerous than initially thought,” he said.

The study included 45 farmworkers in Michigan, who were tested between June and August. Of those with positive results, none had worn respiratory protection, such as face masks, while working with animals, though some used eye protection.

The CDC’s efforts to increase monitoring have faced obstacles, particularly a reluctance from farm owners and workers to participate in testing programs. Researchers like Angela Rasmussen of the University of Saskatchewan expressed frustration with the slow federal response, describing it as “lackluster.”

With H5N1 detected in at least 446 cattle herds across the U.S., the CDC hopes that expanded testing and awareness efforts will help curb the spread of the virus in Michigan and beyond, ultimately protecting both animals and humans.

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