The yeast form of which dimorphic fungus appears as oval or elongate cigar shapes?

The yeast form of Sporothrix schenckii is characterized by its distinct oval or elongate cigar-shaped appearance. This dimorphic fungus has a specific morphology when it transitions to its yeast form, which is typically observed in clinical specimens. Upon viewing under a microscope, these structures can resemble cigars due to their elongated, oval shape.

Sporothrix schenckii is responsible for the disease known as sporotrichosis, which often presents as localized skin lesions. Understanding the yeast morphology is crucial for diagnosing the infection, particularly because it aids in differentiating it from other dimorphic fungi that may present with different shapes or growth patterns in their yeast forms.

The other fungi listed—Coccidioides immitis, Histoplasma capsulatum, and Blastomyces dermatitidis—have their distinct morphological characteristics that differ from the cigar-shaped appearance associated with Sporothrix schenckii. Recognizing these differences is essential for accurate identification and effective medical intervention.