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The spermicide nonoxynol-9 does not inhibit Chlamydia trachomatis in vitro
Sexually Transmitted Diseases
|July 1, 1986
Summary
Nonoxynol-9, an ingredient in spermicides, did not inhibit Chlamydia trachomatis infectivity or growth in laboratory tests. This finding suggests nonoxynol-9 is ineffective against this common sexually transmitted infection.
Area of Science:
- Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Chlamydia trachomatis is a significant cause of sexually transmitted infections.
- Nonoxynol-9 is a common spermicide active ingredient with known antimicrobial properties.
- Understanding the efficacy of spermicides against C. trachomatis is crucial for public health.
Purpose of the Study:
- To evaluate the in vitro antimicrobial effects of nonoxynol-9 and spermicide base against Chlamydia trachomatis.
- To determine if nonoxynol-9 inhibits C. trachomatis infectivity and intracellular growth.
Main Methods:
- In vitro testing of nonoxynol-9 and spermicide base against cell-free elementary bodies of C. trachomatis.
- Assessing the effect on intracellular C. trachomatis growth in McCoy cells after exposure to serial dilutions of agents.
- Evaluating cytopathic effects on host cells at various concentrations.
Main Results:
- Nonoxynol-9 and spermicide base did not affect the infectivity of cell-free C. trachomatis elementary bodies.
- No inhibition of intracellular C. trachomatis growth was observed at non-cytopathic concentrations of nonoxynol-9.
- Significant cytopathic effects on McCoy cells occurred at higher nonoxynol-9 concentrations.
Conclusions:
- Nonoxynol-9 is ineffective in inhibiting the infectivity of Chlamydia trachomatis.
- Nonoxynol-9 does not prevent the subsequent intracellular growth of Chlamydia trachomatis.
- Current spermicides containing nonoxynol-9 are unlikely to prevent C. trachomatis infections.