How do lactobacilli limit infections in the vagina? Select all that apply.
a. They competitively exclude potential pathogens
b. They make hydrogen peroxide
c. They ferment fructose to make lactic acid
d. They lower the vaginal pH, which limits pathogen growth
e. They increase the rate of vaginal mucus secretion

검증된 단계별 안내

Understand that lactobacilli are beneficial bacteria that help maintain vaginal health by creating an environment that is hostile to pathogens.

Recognize that lactobacilli competitively exclude potential pathogens by occupying adhesion sites on the vaginal epithelium, preventing harmful microbes from establishing themselves.

Know that lactobacilli produce hydrogen peroxide (H\_2O\_2), which has antimicrobial properties that inhibit the growth of many pathogens.

Recall that lactobacilli ferment sugars such as fructose to produce lactic acid, which lowers the vaginal pH.

Understand that the lowered vaginal pH (acidic environment) created by lactic acid production limits the growth of many pathogenic organisms, helping to prevent infections.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Competitive Exclusion by Lactobacilli

Lactobacilli occupy adhesion sites on vaginal epithelial cells, preventing harmful pathogens from attaching and colonizing. This competitive exclusion reduces the chance of infection by limiting space and nutrients available to pathogens.

Production of Antimicrobial Substances

Lactobacilli produce substances like hydrogen peroxide and lactic acid, which inhibit the growth of many pathogens. Hydrogen peroxide acts as a potent antimicrobial agent, while lactic acid lowers pH, creating an environment unfavorable for harmful microbes.

Maintenance of Vaginal pH

By fermenting sugars such as fructose, lactobacilli produce lactic acid, which lowers the vaginal pH to around 3.8-4.5. This acidic environment suppresses the growth of many pathogenic bacteria and fungi, helping to maintain vaginal health.