“…There is a great variability in the reported incidence of Chlamydia trachomatis in infertile men, which appears to be related to the methods used. When seminal fluid or urethral smears are cultured (in McCoy cells combined with detection of Chlamydia inclusion bodies), the incidence is around 5% (Busulo et a/., 1984;Hellstrom et al, 1987;Megory et al, 1987;Ruijs et al, 1990). When urethral smears were cultured from 175 infertile men with a poor post-coital test, the number of positives increased to 15% (Soffer et a/., 1990), which is similar to the 14% registered by Nagy et al (1989) in 184 asymptomatic men participating in an IVF programme.…”