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Diagnosing Coccidioides: Microscopic Characteristics and Laboratory Techniques

Explore the identification and differentiation of Coccidioides, a dimorphic fungus, from other organisms in clinical specimens. Learn to distinguish its forms in tissue stains and culture media, enhancing diagnostic accuracy and...

Questions: 5 | Attempts: 10 | Last updated: Oct 24, 2025

Sample Question 1
What are some of the microscopic and macroscopic characteristics of Coccidioides grown at 37 degrees Celsius?

Filamentous growth with no distinguishable structures, macroscopic: a complete absence of growth.

Small irregular structures with no endospores, macroscopic: growth pattern changes drastically.

Presence of unicellular structures with no spore formation, macroscopic: dark pigment formation around the colonies.

Large spherules filled with endospores are present, macroscopic: same as at 25 Coccidioides immitis/posadasii still grow as a mould

Sample Question 2
Does mold or tissue form?

Mold

Neither

Both

Tissue

Sample Question 3
Which form can tissue or mold take?

Solid

Liquid

Mold

Tissue

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