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Serum dependent cell-mediated cytotoxicity of subperiodic Brugia malayi infective larvae in vitro was investigated. In vitro cellular adherence of normal human buffy coat cells to infective larvae of B. malayi was promoted by sera from patients with elephantiasis, tropical pulmonary eosinophilia (TPE) and amicrofilaraemic symptomatic filariasis, as well as by sera from normal subjects from filariasis endemic areas. However, strongest adherence was observed with TPE sera. Scanning electron microscopic (SEM) studies confirmed that the cellular adherence resulted in gross surface damage to the infective larvae. Studies with the indirect fluorescent antibody test (IFAT) suggested that IgG and/or IgM might be involved in the process of adherence. Complement did not appear to be important.
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Sim et al. (1982) studied this question.
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