**Question:** Which of the following is true for candida: September 2011

A. Candidiasis is caused by the ingestion of contaminated food or water.
B. Candida albicans is a normal commensal of the human gastrointestinal and genitourinary tracts.
C. Candida species primarily cause infections in immunocompromised patients.
D. Treatment of candidiasis involves the use of antibiotics.

**Core Concept:** Candidiasis is a group of infectious diseases caused by species of the genus Candida, particularly Candida albicans. The normal flora of the human body includes Candida species found in the gastrointestinal and genitourinary tracts, acting as commensals without causing disease in immunocompetent individuals. Immunocompromised patients are at higher risk of developing invasive candidiasis due to the weakening of the host immune response.

**Why the Correct Answer is Right:**

C. Candida species primarily cause infections in immunocompromised patients is the correct answer because Candidiasis is caused by the overgrowth of normal commensal Candida species in immunocompromised individuals due to a weakened immune system. Candida albicans is a common member of the normal human microbiota, but in the presence of factors such as chemotherapy, organ transplantation, HIV infection, or the use of immunosuppressive medications, the immune system becomes less able to control the growth of Candida, leading to candidiasis.

**Why Each Wrong Option is Incorrect:**

A. Candidiasis is not caused by the ingestion of contaminated food or water. It is primarily an immunocompromised-related disease, not a result of consuming contaminated substances.
B. Antibiotics are not the primary treatment for candidiasis. Instead, antifungal medications such as fluconazole, amphotericin B, or echinocandins are the mainstay of treatment for candidiasis. Antibiotics are not typically used in this context unless the infection is caused by a resistant organism.
D. Candidiasis is not treated with antibiotics; instead, antifungal medications like fluconazole, amphotericin B, or echinocandins are the primary treatment for candidiasis. Antibiotics are usually not used unless the infection is caused by a resistant organism.

**Clinical Pearl:**

Understanding the correct answer helps in differentiating between candidiasis and other infections, as well as recognizing the risk factors that predispose an individual to develop candidiasis. This knowledge is essential for making appropriate treatment decisions and preventing misuse of antibiotics, which can result in antibiotic resistance and further complicate the treatment of infections.