“…These are all factors that have been shown to be critical in the immune control of S. stercoralis, 3,6,7,17 -23 while CD4 + lymphocyte count usually remains within normal limits. 7 The globally down-regulated activation of type 1 immune cells prompted by the concomitant HTLV-1 infection leads to a much more frequent atypical presentation and course of strongyloidiasis (like meningeal, genital, respiratory, intra-abdominal, or muscle localizations), 6,7,19,22 with rare but possible lethal outcome. 6 As a consequence, clinicians should remember that a relapsing strongyloidiasis may herald a missed, concurrent HTLV-1 infection, 7 and the association of strongyloidiasis with HTLV-1 infection may result in a remarkable increase of disseminated or recurring forms of this helminthiasis, also due to a reduced therapeutic response, 3,17 -19 so that a careful and probably lifetime monitoring is recommended for these coinfected patient.…”