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Biology, 21.11.2019 01:31 noeltan12031
During a visit to a hospital, a child receives the oral polio vaccine. he then returns to his distant village. sometime later a polio outbreak occurs in the village, but the child and his siblings, who had not had the vaccine, are spared. what is the explanation for this event?
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During a visit to a hospital, a child receives the oral polio vaccine. he then returns to his distan...
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