In a similar study using elk vaccinated as calves with strain 19 and subsequently challenged as pregnant adults, 29% of vaccinates (13 of 45) calved successfully as compared to 5% (2 of 44) of nonvaccinated control animals. Sixty-two percent (23 of 37) of strain 19 vaccinates calved successfully as compared to 33% (3 of 9) of nonvaccinates. Reduced doses (3.7 × 10 7 to 7.6 × 10 9) did not cause abortion or result in bacteremia, but 45% (19 of 42) of vaccinated elk and 69% (9 of 13) of nonvaccinated elk became infected following challenge. 40 Twenty-seven percent of mature elk vaccinated with a cattle dose of strain 19 aborted. FORBES, in Current Therapy in Large Animal Theriogenology (Second Edition), 2007 Vaccinesīrucella abortus strain 19 is a live vaccine that offers incomplete protection against infection and abortion in elk.
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