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Discussion

Oral polio drops contain

  • A.harvested antibodies
  • B.activated pathogens
  • C.attenuated pathogens
  • D.gamma globulins

Answer: C

Correct answer: attenuated pathogens

The oral polio vaccine contains live virus attenuated by repeated passage so that it replicates in the gut and provokes immunity without causing disease. Replication in the intestinal mucosa is the point - it induces secretory IgA and so interrupts transmission, which the killed injected vaccine does much less well.

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