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Changes in the D-antigen contents of 3 lots of the sIPV after different treatments in a vaccine carrier.
(a) 3 types of lot 20151019.(b) 3 types of lot 20151018.(c) 3 types of lot 20151222.(d) 3 types of 45 samples of all 3 lots. –: release specification.*:0.01 < p < .05; **:p < .01.
