Match the following choices to the culture descriptions in questions 3 through 6:
a. Chlamydia
b. Coccidioides
c. Histoplasma
d. Mycobacterium
e. Mycoplasma
Microscopic examination of a lung biopsy shows spherules.

검증된 단계별 안내

Step 1: Understand the key term in the description — 'spherules'. In microbiology, spherules are a distinctive morphological form seen in certain fungal pathogens, particularly in tissue samples.

Step 2: Recall which organisms from the given list are fungi and which are bacteria. Chlamydia and Mycoplasma are bacteria, Mycobacterium is a genus of acid-fast bacteria, while Coccidioides and Histoplasma are fungi.

Step 3: Identify which fungus is known for producing spherules in tissue. Coccidioides species form large, thick-walled spherules containing endospores during infection, which is a hallmark for diagnosis.

Step 4: Compare this with Histoplasma, which typically forms small yeast cells inside macrophages rather than spherules, so it is less likely to be the correct match.

Step 5: Conclude that the culture description showing spherules in a lung biopsy corresponds to Coccidioides, based on its characteristic morphology.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Spherules in Fungal Infections

Spherules are thick-walled, spherical structures containing endospores, characteristic of certain fungal pathogens like Coccidioides. Their presence in lung tissue indicates a fungal infection, helping differentiate it from bacterial or viral causes.

Coccidioides Biology and Pathogenesis

Coccidioides is a dimorphic fungus causing coccidioidomycosis (Valley fever). In tissue, it forms spherules filled with endospores, which rupture to release infectious particles, leading to lung infection and granulomatous inflammation.

Differentiation of Microbial Cultures by Microscopy

Microscopic examination of cultures or tissue biopsies helps identify pathogens based on morphology. Recognizing unique structures like spherules (Coccidioides), acid-fast bacilli (Mycobacterium), or lack of cell wall (Mycoplasma) is essential for accurate diagnosis.

Match the following choices to the culture descriptions in questions 3 through 6:a. Chlamydiab. Coccidioidesc. Histoplasmad. Mycobacteriume. MycoplasmaMicroscopic examination of a lung biopsy shows spherules.