Related Experiment Videos
Prevalence of antibody to Chlamydia pneumoniae TWAR in japan
1Division of Microbiology, Hiroshima Prefectural Institute of Public Health, Ujinakanda, Japan.
Abstract:
Chlamydia pneumoniae TWAR is a newly recognized Chlamydia species that is a pathogen of respiratory tract infection. To clarify the endemic status of C. pneumoniae in Japan, we evaluated the incidence of C. pneumoniae antibody in 1,330 serum samples (660 from outpatients, 600 from normal individuals, and 70 from cord blood). The antibody titer was determined by a microimmunofluorescence test by using the elementary body of C. pneumoniae TW-183 as the antigen. Immunoglobulin G antibody titers of 1:32 or higher were regarded as evidence of past infection. The detection rate of C. pneumoniae antibody rapidly increased in subjects between the ages of 4 and 7 years, reached 44% in subjects between the ages of 8 and 11 years, and was about 50% in older subjects. The rate did not differ between healthy subjects and outpatients. These results suggest that C. pneumoniae infection is highly endemic in Japan as it is in Western countries. However, the antibody prevalence was high in the low age groups in Japan compared with that in Western countries.
Insights
Chlamydia pneumoniae (C. pneumoniae) infections are common in Japan, with antibody detection rates increasing in children. Prevalence in Japan is similar to Western countries but shows higher rates in younger age groups.
Area of Science:
- * Infectious Diseases
- * Microbiology
- * Epidemiology
Background:
- * Chlamydia pneumoniae (C. pneumoniae) is a significant pathogen responsible for respiratory tract infections.
- * Understanding the endemic status of C. pneumoniae is crucial for public health strategies, particularly in Japan.
- * Previous research indicates C. pneumoniae infections are prevalent globally, but regional variations in endemicity and age-specific prevalence require further investigation.
Purpose of the Study:
- * To determine the endemic status and prevalence of Chlamydia pneumoniae antibodies in the Japanese population.
- * To analyze the age-specific antibody detection rates to understand infection patterns.
- * To compare the prevalence of C. pneumoniae infection in Japan with that in Western countries.
Main Methods:
- * A cross-sectional study was conducted involving 1,330 serum samples from outpatients, normal individuals, and cord blood in Japan.
- * Microimmunofluorescence testing using Chlamydia pneumoniae TW-183 elementary bodies was employed to detect immunoglobulin G (IgG) antibodies.
- * An antibody titer of 1:32 or higher was considered indicative of a past C. pneumoniae infection.
Main Results:
- * The detection rate of C. pneumoniae antibodies increased notably in children aged 4–7 years, reaching 44% in those aged 8–11 years.
- * Approximately 50% of older subjects exhibited detectable C. pneumoniae antibodies, indicating widespread exposure.
- * No significant difference in antibody detection rates was observed between healthy individuals and outpatients, and the prevalence was higher in younger age groups in Japan compared to Western countries.
Conclusions:
- * Chlamydia pneumoniae infection is highly endemic in Japan, mirroring prevalence in Western nations.
- * The study highlights a distinct pattern of high antibody prevalence in younger age groups in Japan compared to Western populations.
- * These findings underscore the need for continued surveillance and potentially targeted interventions for C. pneumoniae in Japan, considering its early-onset endemicity.