A survey for intestinal parasites was carried out in a homogenous rice cultivation area, in which people had equal opportunities of acquiring the local endemic helminthiases, including schistosomiasis mansoni. The numbers of Schistosoma mansoni eggs excreted in faeces were counted. Infections with S. mansoni, Ascaris lumbricoides, ancylostomes and Trichuris trichiura were not randomly distributed, but were correlated, depending on the species of worms present. The S. mansoni egg counts were positively correlated with ancylostome infection but inversely correlated with A. lumbricoides and T. trichiura. Patients with schistosomiasis associated with 2 other helminth infections excreted more S. mansoni eggs than the patients with S. mansoni plus only one other helminth infection.
Heterophil antibodies could be detected in sera from normal or from patient with chronic schistosomiasis. Their hemolytic activities depend on the integrity of the complement classic pathway. The heterophil antibodies from patient sera presented a higher specificity for Schistosoma mansoni antigen preparations than those detected in normal sera. Most of the hemolytic activity observed in normal sera can be destroyed at 56ºC for 4 min. On the other hand, about 80% of the sera from infected patients are partially or totally resistant to this heat-treatment. The hemolytic activities of sera were eluted from a gel filtration column in different fractions of the first peak. Anticorpos heterófilos foram detectados nos soros de pacientes normais ou com esquistossomose mansoni crônica. Suas atividades hemolíticas dependem da integridade da via clássica do sistema do complemento. Os anticorpos heterófilos dos pacientes esquistossomóticos apresentaram maior especificidade para antígenos de Schistosoma mansoni do que aqueles anticorpos detectados nos soros de pacientes normais. A atividade hemolítica do anticorpo nos soros normais podia ser destruída pelo aquecimento destes soros a 56ºC durante 4 minutos. Por outro lado, cerca de 80% dos soros de pacientes esquistossomóticos eram parcial ou totalmente resistentes ao mesmo tratamento. As atividades dos anticorpos heterófilos foram eluídas através da filtração em gel, em diferentes frações no primeiro pico
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