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Serotype patterns of gonococcal infection in contact pairs
1Department of Medical Microbiology, University of Edinburgh, Scotland, UK.
European Journal of Epidemiology
|March 1, 1993
Summary
Discordant Neisseria gonorrhoeae serovars were observed in 12% of sexual contact pairs. Infections with IB serovars showed higher discordance rates than IA serovars, suggesting potential issues in serovar stability or reporting.
Area of Science:
- Microbiology
- Epidemiology
- Sexually Transmitted Infections
Background:
- Gonococcal serovars are crucial for Neisseria gonorrhoeae epidemiology.
- Current research often assumes serovar stability within hosts.
- Understanding transmission dynamics requires examining serovar concordance in sexual partners.
Purpose of the Study:
- To investigate the correlation between serovars identified in patients and their named sexual contacts.
- To determine the rate of discordant serovar findings in linked transmission episodes.
- To explore factors contributing to serovar discrepancies between sexual partners.
Main Methods:
- Analysis of serovars from paired isolates of patients and their sexual contacts.
- Calculation of discordant transmission episode rates.
- Comparison of discordance rates between different serogroups (IA and IB).
Main Results:
- An overall discordant transmission rate of 12% (26/220) was identified.
- Significantly higher discordance was observed for IB serovars (19%) compared to IA serovars (3%) (p < 0.01).
- The prevalence of IB serogroup isolates (53%) did not fully explain the observed correlation.
Conclusions:
- Discordant serovar results in sexual contact pairs are a notable issue in gonorrhea epidemiology.
- Factors such as reporting inaccuracies, technical issues, culture-induced variation, or genetic mutation may contribute to discrepancies.
- Prospective studies combining serotyping with other methods like auxotyping are recommended for accurate microepidemiological analysis and partner notification.