Two directly transmitted viral disease have the same basic reproduction number (r0), even though their dynamics are different. Which of the following differences between the two diseases could lead to the same basic reproduction number? a. One disease has a higher transmission rate and a longer recovery period than the other.
b. One disease has a lower transmission rate and a longer recovery period than the other.
c. One disease has a lower transmission rate and a shorter recovery period than the other.
d. For one disease, the recovery period is long; for the other, no one recovers.