PSI Texas State Board Nail Tech practice exam

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Which of the following is NOT a type of potentially harmful organism that may cause infectious disease?

Staphylococcus
Salmonella
Lactobacillus
Streptococcus

The correct answer is: Lactobacillus

Lactobacillus is recognized as a beneficial bacterium rather than a harmful one. It plays a crucial role in maintaining a healthy balance of microflora in the human body, particularly in the digestive system and the vaginal area. Lactobacillus contributes to the fermentation process of lactose and helps in the production of lactic acid, which can inhibit the growth of pathogenic bacteria. In contrast, Staphylococcus, Salmonella, and Streptococcus are all known pathogens. Staphylococcus can cause a variety of infections, including skin infections and food poisoning. Salmonella is notorious for causing gastrointestinal illness through contaminated food or water. Streptococcus includes species that can lead to conditions such as strep throat and other serious infections. Thus, Lactobacillus stands out as a non-harmful organism, which is why it is the correct answer in this context.