Killed or inactivated vaccines are prepared by

Question

Quizplus · Accepted Answer

Killed or inactivated vaccines are prepared by treating the microbe with formalin, heat, or radiation, which kills or inactivates the pathogen. Option A is incorrect because removal of virulence genes means the microbe can no longer cause disease, and the resulting product would be a genetically modified organism rather than a vaccine. Option C is incorrect because passage through unnatural hosts or tissue culture does not necessarily result in inactivation of the pathogen. Option D is incorrect because long-term subculturing does not necessarily result in inactivation of the pathogen.

Killed or Inactivated Vaccines Are Prepared by