Textbook Question
Which of the following is considered a classical opportunistic fungus?
a. Blastomyces
b. Histoplasma
c. Fonsecaea
d. Aspergillus
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21. Principles of Disease
Characteristics of Infectious Disease
2:09 minutesProblem 13
Textbook Question
The number of mycoses and cases of microsporidiosis worldwide are rising, in part because ______.
a. the number of fungi in the environment is rising
b. the number of immunocompromised individuals in the population is rising
c. fungi have become more pathogenic
d. fungi are developing a new tendency to spread between people
Verified step by step guidance1
Step 1: Understand the context of the problem, which is about the rising number of mycoses and microsporidiosis cases worldwide. These are infections caused by fungi and microsporidia, respectively.
Step 2: Consider the factors that could contribute to an increase in fungal infections. This includes environmental changes, changes in the host population, changes in the pathogens themselves, or changes in transmission patterns.
Step 3: Evaluate each option: (a) an increase in environmental fungi would not necessarily lead to more infections unless other factors are involved; (b) an increase in immunocompromised individuals (such as those with HIV/AIDS, cancer patients, or transplant recipients) makes people more susceptible to opportunistic fungal infections; (c) fungi becoming more pathogenic is less commonly documented as a cause for the rise; (d) fungi developing new transmission tendencies is not a widely recognized factor.
Step 4: Recall that immunocompromised individuals have weakened immune defenses, making them more vulnerable to infections that would not normally cause disease in healthy people. This is a key reason for the rise in fungal infections.
Step 5: Conclude that the most scientifically supported reason for the rise in mycoses and microsporidiosis cases is the increasing number of immunocompromised individuals in the population.
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Immunocompromised Individuals and Susceptibility to Infection
Immunocompromised individuals have weakened immune systems due to conditions like HIV/AIDS, cancer treatments, or organ transplants. This reduced immunity makes them more vulnerable to opportunistic infections, including fungal diseases like mycoses and microsporidiosis, which are otherwise less common in healthy populations.
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Opportunistic Fungal Infections (Mycoses and Microsporidiosis)
Mycoses are fungal infections that often affect people with weakened immune defenses. Microsporidiosis is caused by microsporidia, obligate intracellular parasites related to fungi. Both infections tend to increase in prevalence when host immunity declines, rather than due to changes in fungal pathogenicity or environmental abundance.
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Epidemiological Factors Influencing Fungal Disease Incidence
The rise in fungal infections is influenced by demographic and medical trends, such as increased use of immunosuppressive therapies and aging populations. These factors lead to more susceptible hosts rather than fungi becoming inherently more pathogenic or more abundant in the environment.
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