Soropositividade para doen？a de Chagas entre doadores de sangue em Araraquara, Estado de S？o Paulo, no período de 2004 a 2008

introduction: blood transfusion is an important potential source of chagas disease transmission. methods: files from the araraquara regional blood center were checked regarding the tests results for chagas' disease between january 2004 and december 2008. results: positive serology was diagnosed in 0.04% of 49,541 blood donations that were performed. seropositive individuals were aged between 51 and 60 years-old. conclusions: the low rate of seropositive donors may reduce the risk of transfusion transmission of chagas disease. the high occurrence of inconclusive results indicates that the diagnostic methods must be improved.