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  • Under these assumptions the expected proportion of children shedding vaccine poliovirus after a single SIA i1 can be written i1=y11+y21(1) where y11 is the proportion shedding as a result of direct administration of OPV during the SIA and y21 the proportion shedding as a result of secondary spread of OPV from that SIA (i.e. y11 and y21 differ on the source from which the infection is acquired, the vaccine or a Sabin-infected individual).
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