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Comparison of cytokine ratios (IL-4:IFN-γ) among the infected and uninfected as determined in culture supernatants from PBMC proliferation after 5 days stimulation with S.mansoni antigens and PHA at baseline, 6 and 18 weeks post treatment with praziquantel. The comparison post treatment is between individuals once infected but treated (65) and the non-treated uninfected (28) groups.
