Approximately what percentage of toxoplasmosis cases are congenital?

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Study for the NBEO Ocular Disease Part 1 Test. Use flashcards and multiple choice questions, each with hints and explanations, to prepare for your exam! Get ready for your success!

Multiple Choice

Approximately what percentage of toxoplasmosis cases are congenital?

Explanation:
Congenital toxoplasmosis happens when a pregnant person acquires Toxoplasma infection and the parasite crosses to the fetus. The likelihood of transmission to the fetus increases with gestational age, so infections that occur later in pregnancy are more likely to result in congenital infection. In late pregnancy, the transmission risk can approach high levels, around 90%, which is why this option best fits the typical teaching. The other percentages are either too low to reflect the high late-pregnancy transmission risk or, in the case of 100%, imply that every maternal infection leads to fetal infection, which isn’t true.

Congenital toxoplasmosis happens when a pregnant person acquires Toxoplasma infection and the parasite crosses to the fetus. The likelihood of transmission to the fetus increases with gestational age, so infections that occur later in pregnancy are more likely to result in congenital infection. In late pregnancy, the transmission risk can approach high levels, around 90%, which is why this option best fits the typical teaching. The other percentages are either too low to reflect the high late-pregnancy transmission risk or, in the case of 100%, imply that every maternal infection leads to fetal infection, which isn’t true.

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