PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
Johne's disease research. Cow at a research centre where it has been naturally infected with the bacterium Mycobacterium avium subspecies paratuberculosis. This causes the condition known as Johne's disease. This cow, part of a study herd, is in the late stages of disease and has typical clinical signs such as weight loss, watery diarrhoea, and general poor health. Photographed at the National Animal Disease Center, Ames, Iowa, USA.
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