Common reasons for vaccination failure

  • Lack of maintenance of cold chain from the time of manufacture till vaccination.
  • Poor immune response in weak and improperly fed animals.
  • Lack of herd immunity due to only a few animals being vaccinated.
  • Poor quality of vaccine - Quality will deteriorate if repeatedly thawed and cooled.
  • Low efficiency or ineffective vaccine – may occur in case of strain variation.(eg.FMD)

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