# A nurse is assessing a 45-year-old construction worker who presents to the emergency department with a 2-week history of respiratory symptoms after working in an area with disturbed soil containing bird droppings. Which assessment finding would be most characteristic of histoplasmosis?

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> subject: Adult Health

## 문제

A nurse is assessing a 45-year-old construction worker who presents to the emergency department with a 2-week history of respiratory symptoms after working in an area with disturbed soil containing bird droppings. Which assessment finding would be most characteristic of histoplasmosis?

## 보기

1. Productive cough with green sputum and high fever
2. Sudden onset of severe chest pain and dyspnea
3. Flu-like symptoms with dry cough and fatigue **✔ 정답**
4. Wheezing and shortness of breath with clear sputum

**정답: 3**

## 해설

Histoplasmosis typically presents with flu-like symptoms including dry cough, fatigue, fever, chills, and malaise, especially in the acute form. Other options represent findings more characteristic of bacterial pneumonia (productive cough with green sputum), pulmonary embolism (sudden chest pain and dyspnea), or asthma (wheezing with clear sputum).

## 심화 해설

Understanding the Clinical Presentation of Histoplasmosis

The correct answer is 3. The most characteristic presentation of acute pulmonary histoplasmosis is a set of flu-like symptoms, which typically include a dry cough and fatigue. This aligns with the nonspecific symptom profile described in the provided literature, where patients often present with symptoms that can easily be mistaken for other respiratory illnesses.

Why This is the Correct Answer

Histoplasma capsulatum, the dimorphic fungus that causes histoplasmosis, is endemic to the Ohio and Mississippi River valleys and is found in soil enriched with bird or bat droppings [4]. When soil is disturbed, as in the construction scenario described, microscopic fungal spores become aerosolized and are inhaled. In an immunocompetent host, this initial infection most commonly manifests as a mild, self-limiting respiratory illness. The symptoms are a direct result of the host's inflammatory response to the fungus, leading to the formation of granulomatous nodules in the lung parenchyma, a hallmark of the infection [1]. This inflammatory process produces systemic symptoms like fever, chills, fatigue, and a non-productive cough, which closely mimic influenza. The literature confirms that the clinical presentation is often nonspecific, and patients can even remain entirely asymptomatic [1].

Analysis of Incorrect Options

1. Productive cough with green sputum and high fever

This presentation is more characteristic of an acute bacterial pneumonia, such as pneumococcal pneumonia. Bacterial infections typically cause a robust neutrophilic inflammatory response in the alveoli, leading to the production of purulent, colored sputum. While a high fever can occur in histoplasmosis, the presence of green, productive sputum points away from a primary fungal etiology and toward a bacterial process. The nodular, granulomatous inflammation of histoplasmosis does not typically fill the alveoli with purulent exudate in the same way [1].

2. Sudden onset of severe chest pain and dyspnea

This clinical picture is highly suggestive of a pulmonary embolism or a spontaneous pneumothorax. The hallmark is the sudden and severe nature of the symptoms. Histoplasmosis, particularly in its acute pulmonary form, has a more gradual onset over days to weeks, as seen in the question stem's 2-week history. The granulomatous inflammation develops progressively and does not typically cause a sudden, catastrophic event in an immunocompetent host without significant underlying structural lung disease.

4. Wheezing and shortness of breath with clear sputum

While dyspnea can be present in histoplasmosis, prominent wheezing is a classic sign of bronchoconstriction, often associated with asthma or an acute allergic reaction. Wheezing indicates narrowing of the lower airways, which is not a primary feature of the parenchymal granulomatous disease caused by Histoplasma capsulatum. The infection's primary impact is on the lung tissue itself, forming nodules, rather than causing diffuse bronchospasm. Although mediastinal lymphadenopathy can occur and potentially cause airway compression, this is a less common and more delayed presentation, not the most characteristic acute symptom [4].References (research sources)

- [1]Clinical and computed tomography (CT) features of nodular pulmonary histoplasmosis.Research articleLi F, He Y, Li Y, Qu X, Yu M, Wang W, Li G, Li W. (2026) · DOI: 10.21037/jtd-2025-1-2659

- [4]Histoplasmosis with mediastinal lymphadenopathy in an immunocompetent municipal water department employee in Texas: a case report.Case reportWang T, Fajkus A, Fairweather M. (2026) · DOI: 10.3389/fcimb.2026.1808506

## 임상 시나리오

Histoplasmosis: Clinical RecognitionKey features to distinguish from other respiratory illnesses
Acute pulmonary histoplasmosis most commonly presents as a flu-like illness with dry cough and fatigue in an immunocompetent host.

Think of histoplasmosis when a patient has a history of exposure to disturbed soil containing bird or bat droppings, especially in endemic areas like the Ohio and Mississippi River valleys.

CautionA productive cough with purulent sputum is atypical and should prompt evaluation for bacterial pneumonia. The hallmark of past infection on a chest X-ray is often a solitary pulmonary nodule or hilar lymphadenopathy.

## 핵심 개념

- **Histoplasmosis** — An endemic mycosis caused by inhaling spores of the dimorphic fungus Histoplasma capsulatum, often found in soil contaminated with bird or bat droppings.
- **Dimorphic fungus** — A fungus that can exist as a mold in the environment (25°C) and convert to a yeast form at body temperature (37°C) after inhalation.
- **Granulomatous inflammation** — A pattern of chronic inflammation characterized by aggregates of macrophages and lymphocytes, forming granulomas to contain persistent pathogens like fungi.
- **Lymphohistiocytic response** — An immune reaction dominated by lymphocytes and histiocytes (tissue macrophages), typical in fungal infections, leading to a dry cough rather than purulent sputum.

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