San Francisco health officials announced H5N1 detection in city wastewater last month, after birds at a live market in the city were positively confirmed with the virus.
As federal and state health officials expand their avian flu surveillance, the San Francisco Department of Public Health has reported that avian flu has been detected in wastewater samples collected in May. The samples were collected after two chickens at a live bird market in the city tested positive for the disease on May 9.
No infected dairy cows in California have been detected. Tests of retail milk conducted last month showed genetic fragments of the virus in 20% of samples tested. It has also been detected in meat. Health officials say pasteurization kills the virus, however high levels have been found in raw milk — and cats and mice that drank raw milk from infected cows had high mortality rates. Four people have contracted the disease in the United States; three were dairy workers.
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