Assessment of reproductive tract disease in cats at risk for Tritrichomonas foetus infection.

To determine whether Tritrichomonas foetus infection resides in reproductive tract tissues from cats housed for breeding and for which a high prevalence of colonic T foetus infection has been reported. 61 purebred cats in 36 catteries undergoing elective ovariohysterectomy or castration and for which reproductive tract tissues, feces, and a reproductive history were obtained. Reproductive tract tissues were examined for T foetus via light microscopy, immunohistochemical analysis, and PCR assay. History of reproductive tract disease was examined to detect statistical associations with identified or reported exposure to colonic T foetus infection. 15 of 61 (25%) cats and 22 of 33 (67%) catteries were identified with active or reported T foetus infection. Light microscopic, immunohistochemical, or molecular evidence of T foetus infection of the reproductive tract was not detected in any cats, including 15 cats with colonic T foetus infection, 29 cats residing in a cattery in which T foetus-infected cats were identified, and 8 cats for which gross or light microscopic evidence of reproductive tract disease was identified. There were no differences in total number of litters, number of litters per breeding, kitten mortality rate, or birth defects between cats or catteries infected with T foetus and those for which T foetus infection was not identified. No evidence of reproductive tract colonization by T foetus was detected in this study. Accordingly, it is unlikely that reproductive tract infection with T foetus plays an important role in overall disease transmission.