Why might an attenuated strain or version of a pathogenic microbe be important for vaccine development?
a. Because the attenuated version of the microbe would grow more rapidly in the body and therefore generate a faster immunity or resistance to the microbe
b. Because the microbe would not require as many nutrients and therefore cause a lower degree of pathogenicity in the body
c. Because an attenuated microbe would be less likely to cause autism in vaccine recipients
d. Because it resembles the pathogen and elicits an immune response without causing the original disease
