A Professor of Biology at Davidson College, David Wessner teaches courses about introductory biology, microbiology, and HIV/AIDS. His research interests include viral pathogenesis. He recently co-authored Microbiology, a textbook for undergraduate biology majors, and The Cartoon Guide to Biology.
. The scientists also reported that infectious virus remains detectable in raw milk for up to five weeks. Additionally, heat-treatment of milk significantly reduces the concentration of infectious virus, but does not eliminate it.among cattle in the United States. The virus thus far has been detected in 58 herds in nine states, according to data provided by. Both cases probably occurred via direct contact between the person and an infected animal.
To determine if contaminated milk could transmit the virus, the researchers experimentally inoculated mice orally with 50 microliters, or about a drop, of milk. The mice were observed for four days, and then euthanized. The researchers noted that all mice survived for the four-day period, but began showing some signs of disease, like lethargy, a day after the inoculation.
So, what do these studies tell us? There are three main takeaways from this report. First, the H5N1 avian influenza virus can be transmitted to mammals orally via contaminated milk. Second, the virus remains stable in untreated milk for extended periods of time, if the milk is refrigerated. Third, heat-treatment of milk reduces, but does not eliminate, the infectious virus.
Influenza Virus Dairy Cows Cattle HPAI Flu
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