Certified Medical Assistant Practice Exam

Which of the following organisms causes yeast infection?

1. Candida

2. Staphylococcus

3. Escherichia coli

4. Salmonella

The correct answer is: Candida

The organism that causes yeast infections is Candida. This genus of fungi is a normal inhabitant of the human body, particularly in areas like the mouth, gastrointestinal tract, and vagina. Under certain conditions—such as increased moisture, hormonal changes, or immune system weakness—Candida can proliferate and lead to overgrowth, resulting in conditions like vaginal yeast infections or thrush in the mouth. The other organisms listed do not typically cause yeast infections. Staphylococcus is a genus of bacteria that can cause a variety of infections, but not yeast infections. Escherichia coli is primarily known for its role in urinary tract infections and gastrointestinal issues. Lastly, Salmonella is associated with foodborne illnesses rather than yeast infections. Therefore, the identification of Candida as the causal agent is specific and accurately reflects the typical pathogenic mechanism leading to yeast infections.