Serologic response rates following 3 doses of tOPV for buffer recipients and control infants were 95 % and 88 % ( P = .065 ) , respectively , for type 1 poliovirus ; 95 % and 97 % ( P = .543 ) , respectively , for type 2 poliovirus ; and 90 % and 89 % ( P = .79 ) , respectively , for type 3 poliovirus .