Occurrence of pharyngeal Chlamydia trachomatis is uncommon in patients with a suspected or confirmed genital infection

Acta Obstet Gynecol Scand. 2010;89(1):78-81. doi: 10.3109/00016340903370130.


Objective: To evaluate how common pharyngeal Chlamydia trachomatis (CT) is among mainly heterosexual women and men with a confirmed or a highly suspicious genital infection having had recent unprotected active oral sex.

Design: Prospective observational study.

Setting: Out-patient clinics for sexually transmitted infections in Stockholm.

Population: A total of 143 women and 138 men with a confirmed or suspected genital CT infection and a history of active oral sex.

Methods: Pharyngeal samples from men and women in the study population were analyzed for the presence of CT.

Main outcome measures: Number of positive CT in pharyngeal samples in relation to positive CT in genital samples.

Results: Of the women, 9/128 (7.0%) were positive in the pharyngeal samples. None were exclusively positive in the pharynx. Three of 110 men (2.7%) had pharyngeal involvement. One man was positive in the pharynx as well as in the urine sample, and two men were exclusively pharyngeal CT positive.

Conclusions: The finding of CT in the pharynx is not common in spite of the presence of a genital infection and a history of active oral sex.

MeSH terms

  • Adult
  • Chlamydia Infections / epidemiology
  • Chlamydia trachomatis*
  • Female
  • Genital Diseases, Female / microbiology*
  • Genital Diseases, Male / microbiology*
  • Humans
  • Incidence
  • Male
  • Pharynx / microbiology*
  • Prospective Studies
  • Sexual Behavior
  • Sexually Transmitted Diseases / epidemiology
  • Young Adult