The transmission and impact of paratuberculosis infection in domestic and wild ruminants
2001
Yayo Ayele, W. | Machackova, M. | Pavlik, I. (Vyzkumny Ustav Veterinarniho Lekarstvi, Brno (Czech Republic))
Mycobacterium avium subsp. paratuberculosis (M. paratuberculosis) infects domestic cattle, sheep, goats, deer, camelids and wild ruminants leading to chronic enteritis known as paratuberculosis (Johne's disease). The infection is chronic, progressive and unresponsive to treatment. Most infected animals do not develop clinical disease but may excrete the bacteria. Clinically sick animals suffer emaciation and in some species diarrhoea, followed by eventual death. During the course of the disease, excretion of M. paratuberculosis in faeces and milk occurs, and the organism spreads through the blood and lymph vessels of infected animals to multiple internal organs. Though M. paratuberculosis is not classified as a human pathogen, current opinions on the possible role of this mycobacteria in public health is discussed. This article attempts to review the ways and circumstances by which M. paratuberculosis is transmitted within an animal population and the importance of the disease on animal production. Preventive and control measures are summarised, too.
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