Candidates for screening include people with a history of travel to or residence in endemic areas (recently or even in the distant past) and any of the following: Symptoms that suggest strongyloidiasis Unexplained eosinophilia Infected with HTLV-1 Impending organ transplant (recipient or donor) Impending treatment with corticosteroids Patients with HIV / AIDS do not appear to be at a disproportionally high risk of hyperinfection or disseminated strongyloidiasis and are not candidates for screening in the absence of other risk factors.