PSI Texas State Board Nail Tech practice exam

Which organism is NOT potentially harmful and does NOT cause infectious disease?

1. E. coli

2. Staphylococcus

3. Lactobacillus

4. Salmonella

The correct answer is: Lactobacillus

Lactobacillus is a genus of bacteria that is generally considered beneficial rather than harmful. It plays a critical role in the fermentation process of various foods, such as yogurt, and is essential for gut health by helping maintain a balanced microbiome. This bacterium is known for its probiotic qualities, which can aid digestion and promote a healthy immune response. In contrast, the other organisms listed, such as E. coli, Staphylococcus, and Salmonella, are known to be pathogenic and can cause various infectious diseases in humans, ranging from gastrointestinal issues to more serious systemic infections. Therefore, Lactobacillus stands out as the organism that does not pose a health risk or cause infectious disease, underlining its importance in both food production and human health.