Systemic infection is caused by all fungi except ?
**Core Concept**
Systemic fungal infections, also known as invasive fungal infections, occur when fungi invade and spread through the bloodstream, potentially affecting multiple organs. This can happen in immunocompromised individuals, such as those with HIV/AIDS, undergoing chemotherapy, or taking immunosuppressive medications.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of fungal infections. Fungi such as Candida, Aspergillus, Histoplasma, and Cryptococcus are known to cause systemic infections in humans. These fungi can invade and colonize various tissues, including the lungs, brain, and kidneys. The correct answer is a type of fungus that is not typically associated with systemic infections.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because Candida is a common cause of systemic fungal infections, particularly in immunocompromised individuals.
* **Option B:** This option is incorrect because Aspergillus is another fungus that can cause systemic infections, especially in patients with lung disease or undergoing chemotherapy.
* **Option C:** This option is incorrect because Histoplasma can cause systemic infections, particularly in individuals with compromised immune systems.
* **Option D:** This option is incorrect because Cryptococcus is a well-known cause of systemic fungal infections, particularly in patients with HIV/AIDS.
**Clinical Pearl / High-Yield Fact**
It's essential to recognize that systemic fungal infections can present with non-specific symptoms, such as fever, fatigue, and weight loss, making diagnosis challenging. A high index of suspicion and prompt investigation are crucial in identifying these infections early.
**Correct Answer: D. Cryptococcus**