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Biology

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Feb 20, 2024

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Chapter 22 Post-Lecture Question 6 < 190f19 v Complete M Review v PartA Why is it so difficult to prevent Pneumocystis pneumonia infections from occurring in AIDS patients? » View Available Hint(s) The disease is caused by a fungus, and it is difficult to control the spread of spores. Itis asymptomatic, so it is difficult to detect. Pneumocystis jirovecii is a member of the normal microbiota for most people, and it is difficult to prevent contact with it. The disease is caused by a protozoan with resistant cysts that spread through the dust in the air.
Chapter 22 Pre-Lecture Question 1 1of19 > v Complete M Review v PartA Which of the following routes correctly describes the path air would take from your nose into your body? P View Available Hint(s) nose, trachea, pharynx, bronchiole, bronchus, alveolus nose, trachea, pharynx, bronchus, bronchiole, alveolus nose, pharynx, trachea, bronchiole, bronchus, alveolus nose, pharynx, trachea, bronchus, bronchiole, alveolus Previous Answers v Correct Provide Feedback Next >
Chapter 22 Post-Lecture Question 1 < 20f19 > v Complete M Review v PartA Microorganisms that infect the middle ear cavity most frequently come from the . » View Available Hint(s) sinuses pharynx nasal cavity trachea
Microbe at a Glance: Histoplasma capsulatum - Question 3 v PartA Histoplasma capsulatum is transmitted most commonly through what mechanism? » View Available Hint(s) Histoplasma capsulatum is transmitted via inhalation of airborne spores. Histoplasmosis is a water-bore disease. Histoplasma capsulatum is transmitted through the fecal-oral route. Histoplasma capsulatum is transmitted via contact with infected animals. Previous Answers < 3of19 > v Complete M Review
Microbe at a Glance: Histoplasma capsulatum - Question 2 < 4of19 > v Complete MR Review v PartA v 90-95% of the population of the Ohio River Valley has been exposed to Histoplasma capsulatum, but relatively few individuals are diagnosed with histoplasmosis. Why is this so? » View Available Hint(s) The signs and symptoms of clinical histoplasmosis are often confused with tuberculosis and treated as such. Ahealthy immune system clears the infection before signs and symptoms can appear in these individuals. The signs and symptoms of histoplasmosis are so mild and nonspecific that they are never diagnosed. Because it is a common pathogen in this area of the United States, it is recommended that the population be vaccinated for Histoplasma capsulatum.
Microbe at a Glance: Histoplasma capsulatum - Question 1 < 50f19 > v Complete M Review v PartA v Antibody tests are commonly used for rapid diagnosis of many types of infection. However, they are NOT particularly useful for diagnosis of histoplasmosis. Why is this so? ¥ View Available Hint(s) Cross-reactions with antigens of other closely related fungi make the test unreliable because of false positives. Antibody tests are not useful because no reliable antibodies have been discovered for diagnosis of Histoplasma capsulaturn. Antibody tests are not useful because fungi like Histoplasma capsulatum do not generate an immune response. Antibody tests are not useful because in endemic areas over 95% of the population has been infected without contracting the disease.
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