Abstract
The efficacy of a bacterin prepared from Chlamydia psittaci grown in mouse L-cells was compared to a similar bacterin prepared from C. psittaci grown in chicken embryos (CE). Both bacterins significantly reduced ( P < 0.03) incidence of abortion and weak lambs compared to non-vaccinated control ewes. The L-cell bacterin elicited a greater antibody response than the CE bacterin ( P < 0.03).
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