The incidence of cases of infection with Chlamydia trachomatis is on the rise, the number of cases reported in the USA reaching from 191,000 in 2004 to 385,000 in 2013. At European level, an increase in the number of cases reported since the year 2004 is also observed. Â The actual number of cases is likely higher than that reported, the main reasons for which it is not known its true value being, the following:
1. Lack of diagnosis and proper reporting,
2. High percentage of asymptomatic cases.

