Use the following choices to answer the question given below.
a. Pseudomonas
b. Staphylococcus aureus
c. Scabies
d. Sporothrix
e. Virus
Microscopic examination of the patient’s ulcer reveals 10μm ovoid cells.

검증된 단계별 안내

Step 1: Identify the size and shape of the cells observed under the microscope. The problem states the cells are ovoid and approximately 10μm in size.

Step 2: Recall the typical size ranges and shapes of the organisms listed in the choices: Pseudomonas (bacteria, usually smaller than 5μm), Staphylococcus aureus (cocci bacteria, about 1μm), scabies (a mite, much larger than 10μm), Sporothrix (a fungus with yeast-like ovoid cells around 3-10μm), and viruses (much smaller than 1μm).

Step 3: Compare the observed cell size and shape to the known characteristics of each organism. Since the cells are ovoid and about 10μm, this size fits best with fungal yeast cells like Sporothrix.

Step 4: Exclude options that do not match the microscopic features: bacteria and viruses are too small, and scabies is a mite, which is much larger and not described as ovoid cells.

Step 5: Conclude that the microscopic description most likely corresponds to Sporothrix, a dimorphic fungus known to produce ovoid yeast cells of this size in tissue.

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주요 개념

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

Microscopic Cell Morphology

Understanding the size and shape of cells under the microscope is crucial for identifying microorganisms. Ovoid cells measuring around 10μm suggest a eukaryotic organism, as most bacteria are smaller (1-5μm). This helps differentiate between bacteria, fungi, and other pathogens.

Characteristics of Common Pathogens

Familiarity with the typical features of pathogens like Pseudomonas, Staphylococcus aureus, Sporothrix, viruses, and scabies is essential. For example, Sporothrix is a fungus with ovoid yeast cells about 10μm, while bacteria and viruses differ in size and morphology.

Diagnostic Relevance of Ulcer Examination

Examining ulcers microscopically helps identify the causative agent by revealing cell type and morphology. This guides diagnosis and treatment, as different pathogens require specific therapies, making microscopic findings a key diagnostic tool.

Use the following choices to answer the question given below.a. Pseudomonasb. Staphylococcus aureusc. Scabiesd. Sporothrixe. VirusMicroscopic examination of the patient’s ulcer reveals 10μm ovoid cells.