Final answer:
Sporothrix schenckii is the leading cause of eumycotic mycetoma in the US.
Step-by-step explanation:
The leading cause of eumycotic mycetoma in the US is Sporothrix schenckii. Sporothrix schenckii is a dimorphic fungus found worldwide in the environment. It most commonly causes the disease sporotrichosis, which affects the skin, but can also affect other tissues and organs.
Eumycetic mycetoma, also called fungal mycetoma, is a chronic and debilitating infection caused by filamentous fungi. Though typically found in the "mycetoma belt" regions of Africa, Asia, and Latin America, it can also occur in the US, albeit rarely.