Consider two isolates A and B: microbe 'A' had a LD50 of 5 × 104 while microbe 'B' recorded a LD50of 5 × 107.Which isolate is more virulent?

Consider two isolates A and B: microbe 'A' had a LD50 of 5 × 104 while microbe 'B' recorded a LD50of 5 × 107.Which isolate is more virulent? 



a. cannot tell with information provided
b. microbe A
c. microbe B
d. equally virulent since they killed the animals
e. the values indicate that neither one is virulent


Answer: microbe A


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