Penicillin Resistant Gonococci

Area of Science:

• Microbiology
• Infectious Diseases
• Antimicrobial Resistance

Background:

• Neisseria gonorrhoeae is a significant cause of sexually transmitted infections.
• Penicillin has historically been a primary treatment, but resistance is a growing concern.

Purpose of the Study:

• To determine the minimum inhibitory concentration (MIC) of penicillin for Neisseria gonorrhoeae strains.
• To investigate the prevalence of penicillinase production in these strains.

Main Methods:

• Collected 25 Neisseria gonorrhoeae isolates over 10 months (September 1983 - June 1984).
• Determined the MIC of penicillin for each isolate.
• Assayed for penicillinase production.

Main Results:

• 16 strains had penicillin MICs between 0.01-0.63 ug/ml and were penicillinase-negative.
• 9 strains exhibited higher penicillin MICs (1.25 ug/ml).
• Of the 9 strains with higher MICs, 5 produced penicillinase, with MICs ranging from 1.25 to 2.5 ug/ml.

Conclusions:

• A subset of Neisseria gonorrhoeae strains demonstrated reduced susceptibility to penicillin.
• Penicillinase production is associated with higher penicillin MICs in some strains.
• These findings highlight the emergence of penicillin resistance mechanisms in Neisseria gonorrhoeae.