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144378 Microbiology

An untreated AIDS patient (CD4+ count of 180 cells/mm3) from southern California has developed progressively severe headache and mental confusion, along with ataxia and retinochoroiditis. Focal lesions are present on a computed tomography scan of his brain. No mucocutaneous lesions are found. He has been living under a bridge for the past 2 years. His level of immunoglobulin G (IgG) to the infectious agent is high. What is the most likely explanation for how this current infection staed?

AEarlier exposure to pigeons
BEarlier exposure to dese sand
CReactivation of bradyzoites in cysts from an earlier infection
DRecent exposure to cat feces
Microbiology
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