Criteria used for the classification of cases.
|A||Presence of S. stercoralis larvae in stools||Proven strongyloidiasis|
|B||S. stercoralis serology index ≥ 1.5 and serologic results for other nematodes (i) negative or (ii) positive with a lower index than that of S. stercoralis serology1||Probable strongyloidiasis|
|C||S. stercoralis serology positive but patients not fulfilling grades A or B||Possible strongyloidiasis|
|D||S. stercoralis serology negative and absence of larvae detection||No strongyloidiasis|
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