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Background Inconsistent data exist regarding the influence of parasitic infection on the prevalence of allergic sensitization and disorders. Objective To investigate the impact of geohelminth and protozoan infections on sensitization patterns and allergic symptoms of children living in low-income communities in Gqeberha, South Africa. Methods In a cross-sectional study, 587 school children aged 8-12 years were recruited in June 2016 and screened for reactivity to common allergens by skin prick tests and for parasitic infections by stool tests. Additionally, questionnaires were completed to record allergic symptoms the children may have experienced. Results Positive SPT were found in 237/587 children (40.4%), about one third of whom were polysensitized. Sensitizations were most frequently detected against the house dust mites (HDM) Dermatophagoides spp . (31.9%) and Blomia tropicalis (21.0%). Infections with geohelminths ( Ascaris lumbricoides , Trichuris trichiura ) were found in 26.8% and protozoan infections ( Gardia lamblia , Cryptosporidia spp .) in 13.9% of study participants. Mixed logistic regression analyses revealed negative associations between parasite infection and sensitization to Blomia tropicalis (OR: 0.54, 95%CI 0.33-0.89) and to Dermatophagoides spp . (OR 0.65, 95%CI 0.43-0.96), and between protozoan infection and allergic sensitization to any aeroallergen, although these associations were not significant when adjusted for false discovery. Geohelminth infection and intensity of geohelminth infection were both associated with reduced risk of polysensitization (OR 0.41, 95%CI 0.21-0.86), and this association remained significant with adjustment for false discovery. Reported respiratory symptoms were associated with HDM sensitization (ORs from 1.54 to 2.48), but not with parasite infection. Conclusions and clinical relevance Our data suggest that geohelminth infection and high geohelminth infection intensity are associated with a reduced risk of polysensitization.
