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Localization of classical swine fever virus in male gonads during subclinical infection

Department of Veterinary Pathology, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, Suwon, Kyounggi-Do, Republic of Korea¹

Author for correspondence: Chanhee Chae. Fax +81 31 294 4588. e-mail swine{at}plaza.snu.ac.kr

In an experiment using ten boars, the distribution of classical swine fever virus (CSFV) was determined in the male reproductive tract by in situ hybridization over a period of 120 days after intranasal inoculation. CSFV was detected in the testicular tissue of infected boars. Viral nucleic acid was localized to spermatogonia, spermatocytes and spermatids but was not detected in the epithelia of the prostate, epididymis or bulbourethral gland. Sections from control, CSFV-negative, pigs showed no hybridization signals for CSFV. The demonstration that CSFV infects the spermatogonia (and their progeny) suggests that this may serve as a primary reservoir for the venereal spread of CSFV.