Related Experiment Video
Updated: Jul 6, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
Published on: February 9, 2011
Chronic Chlamydia trachomatis infections in infants
Insights
Many infants with Chlamydia trachomatis infections persist with the condition for months or years without treatment. This prolonged infection can be mistaken for abuse, highlighting the need for accurate diagnosis.
Area of Science:
- Pediatric Infectious Diseases
- Microbiology
- Immunology
Background:
- Chlamydia trachomatis is a common bacterial pathogen affecting infants.
- Congenital C. trachomatis infections can lead to prolonged illness if untreated.
Purpose of the Study:
- To investigate the natural history of Chlamydia trachomatis infections in infants.
- To understand the persistence and serovar-specific antibody responses in infected infants.
Main Methods:
- Bacteriologic and serologic study of an inception cohort of 22 infants with C. trachomatis infections.
- Monitoring infection persistence in various anatomic sites and antibody responses.
Main Results:
- 35% of infants remained infected at 1 year of age.
- One infant had persistent conjunctival, nasopharyngeal, and oropharyngeal infection for over 28 months.
- Serologic data indicated infection acquisition solely at birth, with matching serovars between mothers and infants.
Conclusions:
- Infants can harbor C. trachomatis infections for extended periods without antimicrobial therapy.
- Prolonged infant C. trachomatis infections may be misdiagnosed as sexually transmitted infections or abuse.
Objective:
--To study the natural history of Chlamydia trachomatis infections in infants.
Design:
--Bacteriologic and serologic study of an inception cohort.
Setting:
--University of Washington Medical Center, Seattle.
Participants:
--Twenty-two infants with C trachomatis infections either not treated early in life or recurring after antimicrobial treatment.
Main Outcome Measures:
--Persistence of infection in various anatomic sites, antibody responses to specific serovars (serologic variants) of C trachomatis, and serovars of isolates from mothers and infants.
Results:
--The cumulative proportion of infants still infected at the age of 1 year was 35%. Infection persisted in the conjunctiva, nasopharynx, and oropharynx in one child for as long as 866 days (28.5 months), when she was cured by treatment. In none of the infants did serologic tests suggest acquisition of infection other than at birth. Isolates of C trachomatis from mothers and their respective infants were always of the same serovar.
Conclusions:
--Many infants infected with C trachomatis at birth remain infected for months or years in the absence of specific antimicrobial therapy. Such infections may be confused with those acquired by sexual abuse.
Related Concept Videos
Development of Immunocompetence
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
Development of the Oral Microbiota
Rocky Mountain Spotted Fever
Cytomegalovirus Disease
Toxoplasmosis
American Trypanosomiasis

