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A live attenuated viral vaccine consists of

  • A.purified viral protein only
  • B.antibody prepared in another species
  • C.virus with reduced ability to cause disease but able to replicate
  • D.chemically killed virus that is unable to replicate in the recipient

Answer: C

Attenuation leaves the virus able to multiply enough to provoke a full immune response while no longer producing the illness. Because it replicates, the response is usually broader and longer lasting than an inactivated preparation gives, at the cost of being unsuitable for the severely immunocompromised.

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