Cryptococcus is least likely to cause infection of –
**Core Concept**
Cryptococcus neoformans is an encapsulated yeast that causes cryptococcosis, primarily affecting immunocompromised individuals. The pathogenesis involves the polysaccharide capsule, which interferes with phagocytosis and triggers an inflammatory response.
**Why the Correct Answer is Right**
The correct answer is likely to be the option that is least susceptible to Cryptococcus infection. This is because Cryptococcus primarily infects individuals with compromised cellular immunity, such as those with HIV/AIDS or undergoing chemotherapy. The yeast's polysaccharide capsule allows it to evade phagocytosis, and the lack of effective immune response enables it to cause disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This option may be incorrect if it represents a group of individuals with an intact cellular immune response, such as healthy children or young adults. However, without more information, it's difficult to determine why this option would be incorrect.
**Option B:** This option might be incorrect if it represents a group of individuals with a different type of immune compromise, such as those with chronic granulomatous disease. However, Cryptococcus is less likely to cause disease in individuals with this condition.
**Option C:** This option may be incorrect if it represents a group of individuals with a different type of immune compromise, such as those with autoimmune disorders. However, Cryptococcus is less likely to cause disease in individuals with this condition.
**Option D:** This option might be incorrect if it represents a group of individuals with an intact cellular immune response, such as healthy children or young adults.
**Clinical Pearl / High-Yield Fact**
Cryptococcal infections are more common in immunocompromised individuals, particularly those with HIV/AIDS or undergoing chemotherapy. The polysaccharide capsule of Cryptococcus is a key virulence factor, allowing the yeast to evade phagocytosis and cause disease.
**Correct Answer:** D. Healthy children or young adults.