Killed or inactivated vaccines are prepared by
A)removal of virulence genes from the microbe.
B)treatment with formalin, heat, or radiation.
C)passage of the pathogen through unnatural hosts or tissue culture.
D)long-term subculturing of the microbe.
E)All of the choices are correct.

Question

Quizplus · Accepted Answer

Killed or inactivated vaccines are prepared by treating the microbe with formalin, heat, or radiation. This process destroys the pathogenicity of the microbe while retaining its antigenicity, allowing the immune system to recognize and mount a response against it without causing disease.

Killed or Inactivated Vaccines Are Prepared by