IgG avidity in differential serodiagnosis of human strongyloidiasis active infection

► First description of IgG avidity indexes for strongyloidiasis immunodiagnosis. ► Characterization of disagreement sources between serology and coproparasitology. ► ELISA IgG avidity indexes were lower in patients with active larval output. ► Avidity may distinguish S. stercoralis active infection from suspect cases.