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Relative eosinophilia (defined as an eosinophil percentage >5% but an eosinophil count <450 cells/microL) is significantly associated with helminth infection in recently arrived West African immigrants (odds ratio, 20.5; 95% confidence interval, 2.7-154). The main parasitic causes related to relative eosinophilia are geohelminthic diseases (specifically, hookworms) and schistosomiasis.
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Carranza‐Rodriguez et al. (2008) studied this question.
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