Which of the Following Immunogens is Most Effective as a Vaccine

Question

Which of the following immunogens is most effective as a vaccine?
A) chemically inactivated bacteria
B) dead virus
C) live virus
D) toxoid

Accepted Answer

Live virus vaccines are generally the most effective as they closely mimic a natural infection and stimulate a strong and long-lasting immune response. Dead viruses or inactivated bacteria can still provide protection, but may require booster shots to maintain immunity. Toxoids are vaccines that target the toxins produced by bacteria, but may not stimulate as strong of an immune response as live virus vaccines.