Which parasite is a common cause of retinochoroiditis in immunocompetent individuals?

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Study for the NBEO Microbiology exam. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

Which parasite is a common cause of retinochoroiditis in immunocompetent individuals?

Explanation:
Ocular toxoplasmosis is the classic cause of retinochoroiditis in people with normal immune function. Toxoplasma gondii forms tissue cysts in the retina and can reactivate, leading to a focal necrotizing retinochoroiditis with overlying vitritis. This usually presents unilaterally and may show a “headlight in the fog” appearance on exam. Other parasites listed don’t fit this classic pattern: Acanthamoeba tends to cause keratitis and sometimes CNS infection, Toxocara canis causes granulomatous endophthalmitis more common in children, and Plasmodium vivax is associated with malaria retinopathy rather than a focal retinochoroiditis.

Ocular toxoplasmosis is the classic cause of retinochoroiditis in people with normal immune function. Toxoplasma gondii forms tissue cysts in the retina and can reactivate, leading to a focal necrotizing retinochoroiditis with overlying vitritis. This usually presents unilaterally and may show a “headlight in the fog” appearance on exam. Other parasites listed don’t fit this classic pattern: Acanthamoeba tends to cause keratitis and sometimes CNS infection, Toxocara canis causes granulomatous endophthalmitis more common in children, and Plasmodium vivax is associated with malaria retinopathy rather than a focal retinochoroiditis.

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