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ensure accuracy. the way STDs interact with HIV infection (Pepin
et al., 1989; Piot and Tezzo, 1990; Laga et al., 1991, 1993;
Wasserheit, 1992; Wald et al., 1993; Laga, Diallo, et al., 1994;
Grosskurth et al., 1995). The interrelationship between HIV
infection and chlamydial infection is defined strictly as an
increase in HIV transmission probability (the relative risk) due
to increased HIV susceptibility and infectivity in presence of
the cofactor chlamydial (May and Anderson, 1989; Boily and
Anderson, 1996). To account for the variability in the estimates
from different studies (Plummer et al., 1991; Wasserheit, 1992;
Laga et al., 1993; Wald et al., 1993), it was assumed that
chlamydial increases HIV transmission probability by 3.6- and
5-fold. In this model, the epidemic is seeded by introducing one
HIV infected person in the