National Farm-Level Biosecurity Standard for the Goat Industry
Appendix B: Examples of Modes of Disease Transmission
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Disease | Mode(s) of Transmission | Clinical Signs | Zoonoses? |
---|---|---|---|
Caprine Arthritis Encephalitis (CAE) (CAE virus) | Colostrum and milk Aerosol Body fluids Equipment contaminated with milk or blood Dam to fetus (rare) |
Adults: chronic wasting, enlarged painful joints, mastitis, progressive pneumonia Kids: weakness, paralysis, depression Asymptomatic carriers |
No |
Caseous lymphadenitis (Corynebacterium pseudotuberculosis) |
Direct goat-to-goat contact Contaminated equipment (shears) and environment (feed, water, and bedding); survival in environment can be prolonged Aerosol (if abscesses in lungs) Milk and colostrum (if abscesses in mammary glands) |
Abscesses (usually external, but internal possible) Internal abscesses can lead to other clinical signs, depending on location Asymptomatic carriers |
Yes |
Chlamydiosis/ Ovine enzootic abortion (Chlamydophila abortus) |
Direct contact with aborted material (placenta, fetus) or vaginal secretions Contaminated environment Semen |
Abortion Asymptomatic carriers |
Yes |
Johne's disease/ paratuberculosis (Mycobacterium paratuberculosis subsp. avium) |
Ingestion of feces or material contaminated with feces (milk, feed); can survive in environment for months to years Colostrum and milk |
Chronic progressive wasting Asymptomatic carriers |
No |
Q fever (Coxiella burnetii) |
Direct contact with birth material (placenta, aborted fetus, fluids), vaginal secretions Aerosol Contaminated environment; can survive in environment for months to years Semen |
Abortion | Yes |
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