Listeriosis is caused by the bacteria Listeria monocytogenes. The bacteria is found in soil, water, plant litter, silage and a goat's digestive tract. It is brought on by feeding contaminated silage, sudden changes in feed, stresses of parasitism, dramatic weather changes and/or advanced stages of pregnancy. The source of infection in goats is often not found. Goat milk and goat products may be be source of infection for humans.

Symptoms of the disease include depression, decreased appetite, fever, leaning or stumbling, moving in one direction only, head pulled to flank with rigid neck, facial paralysis on one side, slack jaw and drooling. Abortions may also occur.

Treatment includes administering high doses of penicillin under the direction of a veterinarian, dexamethasone, supportive therapy in the form of fluid and electrolyte administration and supplemental feeding.

Control measures include isolating aborting does from the herd and raising the kids separately. Handling aborted fetuses, placentas and reproductive discharges calls for gloves and face masks as well as careful disposal. Floors and pens should be thoroughly cleaned and disinfected. Avoid drinking unpasteurized milk from goat herds with history of listeriosis.

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