Important Takeaways:
- The state is not one of the 14 others that have reported outbreaks in dairy cattle
- Disease investigators have not been able to determine how a person in Missouri with no known exposures to animals or poultry became infected with an H5 bird flu virus, the principal deputy director of the Centers for Disease Control and Prevention said Thursday.
- But Nirav Shah said the ongoing investigation has turned up no evidence of onward spread of the virus, suggesting this case may turn out to be a one-off infection that defies explanation.
- “Here’s the bottom line: Our influenza surveillance system is designed to find needles in haystacks,” Shah said at a news briefing. “Here in this case, we found such a needle, but we don’t know how it got there. Our investigation continues, and we will keep everyone updated as we learn more.”
- It isn’t unheard of to have cases in which investigators fail to be able to trace a human infection with novel flu viruses back to a source of infection, Shah said, noting that of the more than 500 swine flu infections that have been detected in the U.S. since 2010, about 8% have been in people with no traceable contact with pigs or other infected people.
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Important Takeaways:
- A small study in Texas suggests that human bird flu cases are being missed on dairy farms where the H5N1 virus has taken off in cows, sparking an unprecedented nationwide outbreak.
- Authors of the study, led by researchers at the University of Texas Medical Branch in Galveston, went further, stating bluntly why the US is failing to fully surveil, let alone contain, a virus with pandemic potential.
- “Due to fears that research might damage dairy businesses, studies like this one have been few,” the authors write in the topline summary of their study, which was posted online as a pre-print and had not been peer-reviewed.
- The finding suggests human cases of H5N1 are going undetected. Moreover, managing to find evidence of two undetected infections in a sample of just 14 workers suggests it may not be hard to find more.
- To date, the virus has infected at least 175 dairy farms in 13 states. The official tally of human cases in the dairy outbreak is 14: four in dairy farm workers and 10 in workers on poultry farms with infections linked to the dairy outbreak.
- Experts are anxious that with each new infection, the wily H5N1 virus is getting new opportunities to adapt further to humans. If the virus evolves to cause more severe disease and spread from human to human, it could spark another pandemic.
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