Maria Imaculada Muniz-Junqueira; José Tavares-Neto; Aluizio Prata; Carlos Eduardo Tosta
ABSTRACT
Antibody response to Salmonella typhi O and H antigens was evaluated in 24 individuals with either hepatointestinal or hepatosplenic schistosomiasis mansoni before and after typhoid vaccination, and compared with that of non-infected controls. Before vaccination, Schistosoma-infected patients showed a higher frequency of positive antibody to O antigen and the same frequency to H antigen when compared with that of healthy individuals. However, those with hepatosplenic schistosomiasis showed higher titres of antibody to H antigen than those with hepatointestinal disease or healthy individuals. Infected subjects, particularly those with hepatointestinal disease, showed a decreased response after typhoid vaccine. Tins diminished ability to mount an immune response towards typhoid antigens dining schistosomiasis may interfere ivith the clearance of the bacteria from blood stream and, therefore, play a role in the prolonged survival of salmonella as obsewed in some patients with chronic salmonellosis associated with schistosomiasis.
Keywords: Schistosomiasis mansoni. Salmonella typhi. O and H antigens. Chronic salmonellosis associated with schistosomiasis.
RESUMO
A resposta de anticorpos para os antígenos O e H da Salmonella typhi foi avaliada em 24 indivíduos com esquistossomose hepatointestinal ou hepatoesplênica antes e apôs vacinação antitifoídica, e comparada com a resposta de indivíduos controles normais. Antes da vacinação, pacientes esquistossomóticos mostraram uma maior frequência de anticoipos positivos para o antígeno O e a mesma frequência de anticoipos positivos para o antígeno H quando comparada com aquela de indivíduos controles normais. Porém, aqueles com esquistossomose hepatoesplênica mostraram títulos maiores de anticoipos para o antígeno H do que aqueles com a forma hepatointestinal da doença ou os indivíduos controles normais. Pacientes esquistossomóticos, particularmente aqueles com a forma hepatointestinal, mostraram uma menor resposta após a vacinação antitifoídica. Esta menor capacidade para apresentar uma resposta imune para antígenos de salmonela pode interferir com a retirada da bactéria da corrente sanguínea e, portanto, contribuir como um dos determinantes de sua prolongada sobrevivência como obsewada em pacientes com salmonelose septicêmica prolongada associada â esquistossomose.
Palavras-chave: Esquistosomose rnansoni. Salmonella typhi, Antígenos O e H. Salmonelose septicêmica prolongada associada à esquistossomose.
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Recebido para publicação em 05/10/95.
Adress to correspondence:
Dra Maria Imaculada Muniz-Junqueira.
Laboratório de Imunologia Celular/Depto de Patologia/FCS/UnB,
70910- 900
Brasília, DF, Brasil.
Fax: (061) 233 0296
