U.S. health agencies are starting new rounds of tests on dairy workers and milk products to better understand the possible impact of H5N1 bird flu.
The U.S. Centers for Disease Control and Prevention (CDC) is partnering with the state of Michigan to begin a highly anticipated study to assess whether workers exposed to infected cattle had themselves become infected. And the U.S. Food and Drug Administration (FDA) is testing what鈥檚 known as flash pasteurization after recent studies raised questions about whether the method neutralizes all infectious virus in milk.
The projects are part of a suite of new research announced by federal agencies on Tuesday to understand the dynamics of H5N1 bird flu, which for the first time jumped from birds to dairy cattle around the beginning of the year. Since late March, more than 120 herds across 12 states have tested positive for the highly contagious infection, which appears to be spreading through contact with raw milk, the U.S. Department of Agriculture (USDA) confirmed.
鈥淲e know this to be spread by contact with milk,鈥 said Dr. Eric Deeble, who is the acting senior adviser for highly pathogenic avian influenza at the USDA.
Deeble said that early on, the movement of cattle was largely driving spread of the infection. But since the USDA ordered cattle to be tested before they could be moved state-to-state in late April, the infection has been ferried between farms on shared equipment and shared workers, according to a by the Michigan Department of Agriculture and Rural Development, or MDARD.
鈥淲e know that milk has really high viral loads, and so when we鈥檙e looking at transmission patterns, that鈥檚 a really high risk, it seems,鈥 MDARD Director Dr. Tim Boring said.
How the virus is using humans to hitch a ride 鈥 whether through infection or contaminated clothing or skin 鈥 isn鈥檛 clear yet, Boring said.
鈥淢y guess it鈥檚 perhaps not truly binary, whether it is on people or in people,鈥 Boring said.
Dairy farmers have been reluctant to let government officials onto their farms for widespread testing of their herds, and farm workers have shied away from testing, even when they have symptoms. Advocates say workers are reluctant to test since it might mean missing work and pay.
Last week, Michigan said it would a maximum of US$28,000 each to participate in research. That financial assistance is on top of funds the federal government is offering.
The offer seems to have worked. On Tuesday, the CDC announced that it had partnered with the Michigan Department of Health and Human Services to launch a study to test the blood of farm workers for antibodies to the H5N1 virus.
鈥淭he point of this study is to determine if there is asymptomatic infection鈥 of workers who have been exposed to cows infected with the H5N1 virus, said Dr. Demetre Daskalakis, director of the CDC鈥檚 National Center for Immunization and Respiratory Diseases.
The FDA also announced Tuesday that it has started another round of dairy product sampling to address gaps in its previous testing. This time, the 155 products it鈥檚 plucking from store shelves will include raw milk cheeses, cream cheese, ice cream and butter, said Dr. Don Prater, acting director of the FDA鈥檚 Center for Food Safety and Applied Nutrition.
Earlier this year, FDA鈥檚 initial testing of milk and sour cream and other and other kinds of dairy products purchased at grocery stores found traces of virus in one out of five items sampled. Further testing confirmed, however, that those viral fragments were inactive and couldn鈥檛 make anyone sick, leading the agency to declare milk and other dairy products safe to consume, as long as they鈥檙e pasteurized.
But published in the New England Journal of Medicine raised new questions. The studies heated raw, infected milk to the times and temperatures used for flash pasteurization 鈥 the most common form of pasteurization in the U.S. 鈥 and found that while it greatly reduced levels of infectious virus in milk, it didn鈥檛 completely neutralize all of it.
Scientists cautioned, however, that because the experiments didn鈥檛 replicate the full flash pasteurization process, including a pre-heating step, more research was needed. Prater said the FDA believes its experiments are closer to the method used in commercial milk processing.
Also on the are studies to measure the persistence of the virus in cheese as it ages, and pooled testing of raw milk samples from dairies.
Prater didn鈥檛 give a specific timeline for when the agency would have results from those studies, but said it hope to have the information in the very near future.
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Millions are celebrating Canada鈥檚 157th birthday this year -- as they do every year -- with fireworks, food and family. In Newfoundland, it is a day of mourning for one of the bloodiest battles of the First World War.
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