In earlier studies carried out between 1951 and 1970, a total of 298 patients with mumps orchitis were examined in the Sexological Institute in Prague (Barták, Nedoma & Mirovský, 1955; Skálová, Barták & Nevařilová, 1966; Barták, Skálová & Nevařilová, 1968). This number included 178 adults between 19 and 53, and 120 youths between 13 and 18 years of age. The findings can be summarized as follows. (1) Adults suffered more frequently (29%) than youths (13%) from bilateral orchitis. (2) Ejaculates were examined within 1 to 3 months following bilateral or unilateral orchitis. Spermiogenesis was severely disrupted in 50% of the patients, giving rise to oligospermia, necrospermia and azoospermia. Clinical signs of damage to the testes (diminished testicular volume, painfulness, poor consistency) were manifest in this period in 40 % of the youths and 55 % of the adults. Later,
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