USMLE what does it mean to have positive anti-Toxoplasma IgG?

[das0088]

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one of the free practice questions from usmle website says a HIV pt with positive anti-Toxoplasma
IgG , positive anti-cytomegalovirus IgG and CD4 count 32. MRI brain shows multiple ring-enhancing lesions. Why is the answer still toxo. Shoundn't he be immune to toxo since he has anti-toxo IgG. thanks in advance!

 

[iscream4icecream]

Immunodeficient pts. are at risk for reactivation of toxo
i don't think that IgG is exactly specifically pertinent to the ddx for immunodeficient pts--> it should more be used to know if a pt. is at risk for reactivation. if you know that the pt. is at risk for reactivation you would rely on/monitor clinical signs (multiple ring-enhancing lesions on MRI), or PCR levels to ddx reactivation of toxo