What is the most common yeast infection responsible for oral thrush?

Candida albicans is the most common yeast responsible for oral thrush, which is an infection characterized by white patches in the mouth and throat. This organism is part of the normal flora in the human body, particularly in the gastrointestinal tract, but can become pathogenic under certain conditions, such as immunosuppression, antibiotic use, or hormonal changes.

In cases where the usual defenses of the oral mucosa are compromised, Candida albicans can proliferate, leading to the characteristic symptoms of oral thrush. This condition is often encountered in individuals with weakened immune systems, those who wear dentures, or patients who have recently been on antibiotics that disrupt the natural balance of flora.

Other options, such as Aspergillus, Cryptococcus, and Histoplasma, are not typically associated with oral thrush. Aspergillus species are known for causing respiratory infections, while Cryptococcus is primarily associated with meningoencephalitis, particularly in immunocompromised individuals. Histoplasma is known to cause respiratory disease, especially in endemic areas, but it is not commonly linked to oral thrush. Thus, the selection of Candida albicans as the causative organism is based on its prevalence and association with this condition.