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Quiz: Toxoplasma gondii & Pregnancy

Radford G. Davis, DVM, MPH, DACVPM, Iowa State University

Zoonoses & Public Health Concerns

|July 2016|Peer Reviewed|Web-Exclusive

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Toxoplasma gondii is a zoonotic disease with notable significance to pregnant women. This quiz reviews important facts about the disease, its transmission, and its relevance to human health.

9  Questions
Multiple Choice Questions
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Quiz: Toxoplasma gondii & Pregnancy

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1/9  Questions
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A pregnant client brings her 4-year-old neutered cat for vaccinations and routine checkup. She mentions that her physician recommended that she find another home for her indoor/outdoor cat because of the high-risk associated with contracting Toxoplasma gondii infection from cats that are allowed to freely roam.

How do cats most commonly become infected with T gondii?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
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The veterinarian tells the client that cats, as the definitive host for T gondii, will shed oocysts in their feces, thereby contaminating humans, other animals, and the environment. The client asks how long a cat can shed oocysts.

Which of the following statements best describes the duration of shedding of T gondii oocysts by cats?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
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Once T gondii oocysts sporulate, they become infective and environmentally resistant and survive best in humid, warm environments out of direct sunlight.5

Although sporulation is temperature dependent, typically what is the minimum time that T gondii oocysts need to sporulate?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
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A client is concerned about acquiring T gondii infection directly from her cat. The veterinarian explains that because cats only shed oocysts for up to 3 weeks after infection (usually early in life), rarely have diarrhea when infected, and regularly groom themselves, contracting oocysts directly from cat fur is an unlikely means of acquiring infection.5,10 The veterinarian also mentions that there are more common sources of infection for humans.

Which of the following is not a source by which humans can acquire T gondii?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
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The veterinarian informs the client that because her cat goes outdoors, it likely has already been exposed to T gondii and become infected.

What is the estimated overall seroprevalence of T gondii infection in cats in the United States (as measured by being seropositive to immunoglobulin M [IgM], IgG, or both antibodies)?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
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The client asks whether her cat can be tested for T gondii infection to determine the risk associated with a human contracting the infection.

Which of the following tests is best for determining whether a cat is infectious to humans?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
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During their conversation it becomes clear that the client has not been tested for T gondii infection, the veterinarian thusly recommends that the client see her physician.

Which of the following statements about pregnancy, T gondii infection, and risk for the fetus is most accurate?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
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Given what the veterinarian has told the client about the prevalence of T gondii infection in cats in the United States, the client is curious about how common T gondii infection is in the US human population.

Based on CDC data, what is the estimated percentage of the US population 12 years of age or older that has been exposed to T gondii (based on serologic testing)?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
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After discussing and reviewing all available information on T gondii infection, the veterinarian and client agree on recommendations for best avoiding the risks for infection.

Which of the following is NOT recommended to help prevent T gondii infection in pregnant clients?

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Quiz: <em>Toxoplasma gondii</em> & Pregnancy
9/9  Questions
Multiple Choice Questions
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Quiz: <em>Toxoplasma gondii</em> & Pregnancy

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References and Author Information

For global readers, a calculator to convert laboratory values, dosages, and other measurements to SI units can be found here.

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