Ch. 24 - Microbial Diseases of the Respiratory System

Tortora - Microbiology: An Introduction 14th Edition

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Tortora 14th Edition

Ch. 24 - Microbial Diseases of the Respiratory System

Problem 7

Chapter 24, Problem 7

List the causative agent, mode of transmission, and endemic area for the diseases histoplasmosis, coccidioidomycosis, blastomycosis, and Pneumocystis pneumonia.

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Identify the causative agent for each disease by reviewing the specific fungal species responsible: Histoplasmosis is caused by \(\textit{Histoplasma capsulatum}\), Coccidioidomycosis by \(\textit{Coccidioides immitis}\) or \(\textit{Coccidioides posadasii}\), Blastomycosis by \(\textit{Blastomyces dermatitidis}\), and Pneumocystis pneumonia by \(\textit{Pneumocystis jirovecii}\).

Determine the mode of transmission for each disease, focusing on how the infectious spores or organisms enter the human body. Typically, these fungi are inhaled as airborne spores from environmental sources such as soil or bird droppings.

Identify the endemic areas by researching the geographic regions where each disease is commonly found. For example, Histoplasmosis is endemic in the Ohio and Mississippi River valleys, Coccidioidomycosis in the southwestern United States, Blastomycosis in areas around the Great Lakes and the Mississippi River, and Pneumocystis pneumonia is more widespread but primarily affects immunocompromised individuals worldwide.

Organize the information into a clear table or list format with three columns or categories: causative agent, mode of transmission, and endemic area for each disease to facilitate comparison and memorization.

Review and verify the information using reliable microbiology or infectious disease sources to ensure accuracy and completeness before finalizing your answer.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Causative Agents of Fungal and Pneumocystis Infections

Understanding the specific pathogens responsible for each disease is essential. Histoplasmosis is caused by Histoplasma capsulatum, coccidioidomycosis by Coccidioides species, blastomycosis by Blastomyces dermatitidis, and Pneumocystis pneumonia by Pneumocystis jirovecii, a fungal-like organism. Identifying these agents helps in diagnosis and treatment.

Modes of Transmission

Each disease has a distinct mode of transmission, primarily involving inhalation of airborne spores or organisms from environmental sources. Histoplasmosis, coccidioidomycosis, and blastomycosis are typically acquired by inhaling fungal spores from soil, while Pneumocystis pneumonia is transmitted via airborne person-to-person spread, especially affecting immunocompromised individuals.

Endemic Areas and Environmental Reservoirs

Knowledge of the geographic distribution and environmental niches of these pathogens aids in epidemiology and risk assessment. Histoplasmosis is endemic in the Ohio and Mississippi River valleys, coccidioidomycosis in the southwestern United States, blastomycosis in areas around the Great Lakes and Mississippi River, and Pneumocystis pneumonia occurs worldwide, mainly in immunocompromised hosts.

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Related Practice

Textbook Question

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 ovoid cells in alveolar macrophages. You suspect these are the cause of the patient’s signs and symptoms, but your culture grows a filamentous organism.

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Textbook Question

In San Francisco, ten animal health care technicians developed pneumonia 2 weeks after 130 goats were moved to the animal shelter where they worked. Which of the following is false?

a. Diagnosis is made by a blood agar culture of sputum.

b. The cause is Coxiella burnetii.

c. The bacteria produce endospores.

d. The disease was transmitted by aerosols.

e. Diagnosis is made by complement-fixation tests for antibodies.

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Textbook Question

Briefly describe the procedures and positive results of the tuberculin test and what is indicated by a positive test.

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Textbook Question

Which of the following leads to all the rest?

a. Catarrhal stage

b. Cough

c. Loss of cilia

d. Mucus accumulation

e. Tracheal cytotoxin

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Textbook Question

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.

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Textbook Question

A patient has been diagnosed as having pneumonia. Is this sufficient information to begin treatment with antimicrobial agents? Briefly discuss why or why not.

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