Detection of endocervical anti-Chlamydia trachomatis immunoglobulin A in pregnant women by a rapid, 6-minute enzyme-linked immunosorbent assay: Comparison with PCR and chlamydial antigen detection methods Academic Article uri icon


MeSH Major

  • Antibodies, Bacterial
  • Antigens, Bacterial
  • Chlamydia Infections
  • Chlamydia trachomatis
  • Enzyme-Linked Immunosorbent Assay
  • Immunoglobulin A
  • Pregnancy Complications, Infectious


  • There is a need for a rapid, uncomplicated, and inexpensive test for Chlamydia trachomatis infection in women. We evaluated the ability of a 6-min enzyme-linked immunosorbent assay (ELISA) that requires no laboratory equipment (IgA Rapid SeroTest; Savyon Diagnostics) to detect C. trachomatis immunoglobulin A (IgA) in the endocervices of 167 inner-city pregnant women and compared the results with DNA amplification (Amplicor PCR; Roche Diagnostics) and antigen detection (Chlamydiazyme; Abbott Laboratories) performed on the same women. Anti-C. trachomatis IgA was detected in the cervices of 32 women (19.2%). Samples from 23 women (13.8%) were PCR positive, while chlamydial antigen was present in 20 women (12.0%). There was only 1 sample (4.3%) that was positive by PCR but negative by ELISA; 10 samples were ELISA positive and PCR negative. In contrast, seven samples (30.4%) were PCR positive but Chlamydiazyme negative and four were Chlamydiazyme positive and PCR negative. Compared to PCR, the IgA ELISA had a sensitivity of 95.7%, a specificity of 93.1%, a positive predictive value of 68.8%, and a negative predictive value of 99.3%. The antigen assay had a sensitivity of only 69.6%, a specificity of 97.2%, a positive predictive value of 80.0%, and a negative predictive value of 95.2%. In high-risk groups where laboratory testing is not available, or where the patient might not return to obtain her testing result and be treated, the Rapid IgA SeroTest is a viable alternative for detection of cervical C. trachomatis in pregnant women.

publication date

  • July 1997



  • Academic Article



  • eng

PubMed Central ID

  • PMC229841

PubMed ID

  • 9196193

Additional Document Info

start page

  • 1781

end page

  • 3


  • 35


  • 7