Abstract
Five-week-old male BALB/c mice were inoculated intraperitoneally with a single (sP1) or multiple doses (mP1) of porcine circovirus-like virus P1 or cell culture medium. None of the mice exhibited clinical signs or gross lesions throughout the study. However, the body weights of the mP1 mice were significantly decreased, and the mice inoculated with P1 exhibited viral replication, seroconversion, and microscopic lesions. P1 nucleic acid was detected in the heart, liver, spleen, lung, bladder, testis, brain, thymus, and pancreatic tissues. Special P1 antibody was found in the P1-inoculated mice. Microscopic lesions in the sP1 and mP1 mice were characterized by interstitial pneumonia, including edema in the connective tissue around the pulmonary vessels, mild inflammatory cell infiltrate, thickened alveolar walls, myocardial necrosis, and dissolution of Purkinje cell nuclei. The results showed that the P1 virus could infect BALB/c mice. Thus, BALB/c mice may serve as models for P1 research.
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