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  • Title: Natural mycoplasmal infections in isolator-maintained LEW/Tru rats.
    Author: Cox NR, Davidson MK, Davis JK, Lindsey JR, Cassell GH.
    Journal: Lab Anim Sci; 1988 Aug; 38(4):381-8. PubMed ID: 3263542.
    Abstract:
    For 4 years a colony of cesarean-derived, isolator-maintained LEW/Tru rats was evaluated for mycoplasmal infection by serology, culture and histopathology. Anti-mycoplasmal antibodies were detected by enzyme-linked immunosorbent assay (ELISA), and the colony eventually was found to have inapparent infections of Mycoplasma pulmonis and Mycoplasma arthritidis. Rats, naturally infected with M. pulmonis, remained consistently positive in the M. pulmonis ELISA after their initial seroconversion, and eventually developed clinical signs and lesions of respiratory and genital mycoplasmosis. M. pulmonis was apparently eliminated by serological testing and removal of infected rats. Rats naturally infected with M. arthritidis did not develop clinical or histologic evidence of mycoplasmal disease and their sera gave inconsistent results in the M. pulmonis ELISA, but eventually developed positive M. arthritidis ELISA responses. M. arthritidis was isolated from the genital tract, the intestinal tract, and Harderian gland. In contrast to M. pulmonis, removal of serologically positive animals was not sufficient for elimination of M. arthritidis from the colony.
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