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[Epidemiological and bacteriological study on gonococcal infections].

M Nishimura1, Y Kumamoto, T Hirose

  • 1Department of Urology, Sapporo Medical College.

Kansenshogaku Zasshi. the Journal of the Japanese Association for Infectious Diseases
|June 1, 1992
PubMed
Summary

This study tracked Neisseria gonorrhoeae in Sapporo, Japan, finding younger infections and shifts in penicillinase-producing strains. Penicillinase-producing Neisseria gonorrhoeae (PPNG) rates declined after 1985.

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Area of Science:

  • Microbiology
  • Epidemiology
  • Public Health

Background:

  • Neisseria gonorrhoeae infections present evolving challenges in diagnosis and treatment.
  • Understanding demographic and microbiological trends is crucial for effective public health interventions.

Purpose of the Study:

  • To analyze epidemiological and bacteriological characteristics of Neisseria gonorrhoeae in Sapporo, Japan, between 1980 and 1991.
  • To identify trends in patient demographics, infection sources, and antimicrobial resistance patterns.

Main Methods:

  • Retrospective epidemiological and bacteriological analysis of Neisseria gonorrhoeae isolates.
  • Data collection on patient age, sex, infection source, and Neisseria gonorrhoeae strain characteristics including auxotype and penicillinase production.

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Main Results:

  • Infections in Sapporo skewed younger compared to national averages.
  • Transmission patterns varied by age, with younger males infected by non-professional partners and older males by professional partners.
  • Professional female partners showed a 17.4% gonorrhea positivity rate, with teens having the highest cervicitis morbidity.
  • A gradual increase in the latent period of gonococcal infections was observed.
  • Penicillinase-producing Neisseria gonorrhoeae (PPNG) peaked at 23.9% in 1985, declining to 3.7% by 1991.
  • Non-PPNG strains showed a shift from proto/Pro-strains to AHU-strains, while most PPNG strains were proto or Pro-strains.
  • AHU-strains demonstrated greater sensitivity to AMPC compared to proto or Pro-strains.

Conclusions:

  • Sapporo experienced distinct Neisseria gonorrhoeae epidemiological trends, including a younger demographic and changing resistance profiles.
  • The decline in PPNG and the rise of specific non-PPNG auxotypes suggest evolving gonococcal populations.
  • Auxotype variations correlate with antimicrobial sensitivity, impacting treatment strategies.