In systemic mycoses, each causative species has a preferred organ to invade.

In systemic mycoses, each causative species has a preferred organ to invade.

• A. False
• B. Not specified
• C. True
• D. Unknown

Answer: (C)

The main idea here is tissue tropism: systemic fungal pathogens often have a preferred organ or tissue they tend to affect. This isn’t random spread—each species interacts with host tissues in ways that bias where disease shows up. For example, Histoplasma capsulatum tends to travel through the reticuloendothelial system after being inhaled, so the liver, spleen, and bone marrow are commonly involved. Cryptococcus neoformans has a strong propensity for the central nervous system, leading to meningitis, especially in people with weakened immunity. Blastomyces dermatitidis frequently presents with skin and bone lesions in addition to lung involvement. Paracoccidioides brasiliensis likewise often affects mucocutaneous regions. Coccidioides species primarily cause lung disease but can disseminate to other sites, including meninges. Because these fungi show characteristic organ involvement patterns, the statement that each causative species has a preferred organ to invade reflects clinical reality. Of course, there can be exceptions with dissemination to other organs, but the typical predilections explain the common clinical presentations.

The main idea here is tissue tropism: systemic fungal pathogens often have a preferred organ or tissue they tend to affect. This isn’t random spread—each species interacts with host tissues in ways that bias where disease shows up.

For example, Histoplasma capsulatum tends to travel through the reticuloendothelial system after being inhaled, so the liver, spleen, and bone marrow are commonly involved. Cryptococcus neoformans has a strong propensity for the central nervous system, leading to meningitis, especially in people with weakened immunity. Blastomyces dermatitidis frequently presents with skin and bone lesions in addition to lung involvement. Paracoccidioides brasiliensis likewise often affects mucocutaneous regions. Coccidioides species primarily cause lung disease but can disseminate to other sites, including meninges.

Because these fungi show characteristic organ involvement patterns, the statement that each causative species has a preferred organ to invade reflects clinical reality. Of course, there can be exceptions with dissemination to other organs, but the typical predilections explain the common clinical presentations.