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Anti-PGL-1 serology (ELISA index [EI]) behavior during follow-up of 5 blood donors who developed leprosy and presented seropositivity in 2009. The antibody titers were expressed as the EI according to the following formula: EI = ODsample/ODcutoff, where OD is optical density, as described previously (4). EI values of >1.1 were considered positive.
