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8804 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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8807 Microbiology

The sputum specimen of a 70 year old male was cultured on a 5% sheep blood agar. The culture showed the presence of Ξ±-hemolytic colonies next day. The further processing of this organism is most likely to yield –

AGram positive cocci in short chains, catalase negative and bile resistant
BGram positive cocci in pairs, catalase negative and bile soluble
CGram positive cocci in clusters, catalase positive and coagulase positive
DGram negative coccobacilli catalase positive and oxidase positive
Microbiology
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