Vaccine development. Microbiologist purifying proteins to be used in a vaccine against Johne's disease in cattle. Johne's disease is caused by the bacterium Mycobacterium avium paratuberculosis and causes losses exceeding 200 million US dollars in the USA every year. Cows may not show symptoms for up to 5 years after infection,although throughout this time they can spread the bacteria to other cows | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Greb, Peggy / US Department of Agriculture |
Bildgröße: | 2457 px × 3661 px |
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