In recent years, vaccines have come under scrutiny for possibly causing autism and other potentially serious side effects. Even though those concerns have been proven false, and the benefits of vaccines outweigh their risks, the rate of vaccines is declining, which is affecting herd immunity. Which of the following statements about herd immunity is correct? A. Declining vaccination rates do not have an effect of herd immunity.
B. All individuals in the population will have to be immune to the infectious disease in order for herd immunity to be effective.
C. Herd immunity protects individuals that are not immune, because the number of susceptible individuals is greatly decreased.
D. Herd immunity is only effective for viral infectious diseases.