Vaccines are available for both Vibrio and Chlamydia, often in the same injection. They are designed for use at the beginning of the breeding season. They are killed vaccines, thus two shots are required the first year. After a ewe has received her initial two-vaccination series, only a single vaccination needs to be given in subsequent years. Some large producers have achieved good results simply by vaccinating replacement ewes.
Toxoplasmosis is a common intestinal, protozoal infection in cats.
It can cause abortion in sheep at any stage of pregnancy, depending upon the stage during which the ewe was infected. It is generally accepted that ewes become infected when they ingest feed or water which has been contaminated with infected cat feces. Unfortunately, there is no vaccine available in the U.S. to prevent toxoplasmosis. In order to develop a course of action and prevent abortion storms in subsequent years, the specific cause of abortion must be determined. Diagnosis is based on clinical signs and flock history, combined with laboratory diagnostics.