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Table 1

Criteria used for the classification of cases.

Grade Description Status
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

Direct comparison of serology indexes is possible only if both techniques have the same positivity threshold.

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