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More US bird flu spread would heighten human infection risk, officials say
Additional spread of the virus could increase the risk to public health, which is currently low, said Nirav Shah, principal deputy director for the U.S. Centers for Disease Control and Prevention.
FILE PHOTO: Test tubes labelled / REUTERS/Dado Ruvic
(Reuters) -Further spread of bird flu among U.S. dairy herds presents additional opportunities for human infections, federal officials said on June 13 while urging farms to take enhanced biosecurity measures to contain the virus.
Bird flu has been reported in 94 dairy herds across 12 states since late March, according to the U.S. Department of Agriculture.
The risk to public health is currently low, though additional spread of the virus could increase that risk, said Nirav Shah, principal deputy director for the U.S. Centers for Disease Control and Prevention, on a briefing call with reporters.
"The more infections there are among cows, the more risk there is for infections to occur among humans," Shah said.
The CDC has monitored more than 500 people and tested at least 45 during the current outbreak, Shah said.
Three dairy farm workers have tested positive since the virus began circulating among dairy cows. A genetic analysis of the third human case found no signs of mutations in the virus that would make it easier to transmit among people, Shah said.
Asked whether the CDC should be testing people who have been exposed to the virus but are not symptomatic, Shah said the agency is confident in its current testing strategy.
Testing asymptomatic people could result in identifying people who are carrying virus in their nose that would not actually cause an infection, he said. The spread among dairy farms is likely occurring from animal movement, shared personnel, and vehicles and equipment that travel between farms, Kammy Johnson, a veterinary epidemiologist with the USDA said on the call.
Biosecurity practices like cleaning equipment and limiting movement of sick animals are important to containing the spread of the virus, Johnson said.
Farmers from 11 of the 94 infected dairy herds have signed up for financial support from USDA, said Mark Lyons, a USDA official.
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