日本性感染症学会誌 Journal of Japanese Society for Sexually Transmitted Infections

This research compares Chlamydia trachomatis (CT) serotype distribution in two different patient groups, those from sexually transmitted infection clinics that are part of the National Epidemiological Surveillance of Infectious Diseases and those who had anonymous sexually transmitted infection examinations held by public facilities [public health center and Tokyo Metropolitan Minami-shinjuku Testing and Counseling Office] in Tokyo from 2009 to 2018. A total of 1088 CT-positive specimens were tested by DNA sequencing analysis to determine their serotypes.

Our results indicated that the most common CT serotype was E (n=245, 22.5%), followed by D/Da (n=238, 21.9%), F (n=200, 18.4%), G (n=127, 11.7%), H (n=79, 7.3%), J/Ja (n=68, 6.3%), K (n=52, 4.8%), B/Ba (n=41, 3.8%), and I/Ia (n=38, 3.5%). The dominant serotypes in Tokyo, accounting for 62.8%, were D/Da, E, and F. The following serotypes were not found: A, C, and L. Overall, the proportion of the H type serotype in people in their 50s was high, and the proportion of D/Da type was low. The rate of the type F serotype in men from the Tokyo Metropolitan Minami-shinjuku Testing and Counseling Office was significantly lower than that seen in women (p<0.05).

In conclusion, the dominant CT serotypes in Tokyo during our 10-year research period were D/Da, E, and F. There was no significant difference between facilities, age groups, sex, or annual distinction.