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In Guinea-Bissau we conducted a randomized trial of OPV0 versus No OPV0 to test the effect of not receiving OPV0 on infant mortality and morbidity. In two subgroups of participants, 6-week-old children and 6-month-old children, we investigated the effect of OPV0 on neutralizing antibodies against poliovirus type 1 and 3. A subgroup of infants randomized to receive OPV0 or No OPV0 in addition to...
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