Since 1990, at least thirty new emergent human diseases have been identified. These include avian influenza, West Nile virus, Severe Acute Respiratory Syndrome, and Middle East Respiratory Syndrome. Historically important diseases
have reemerged as well as population densities increase. Calculate the approximate annual rate of new and emergent
diseases that have been discovered since 1990.
A)
1 per year
B)
1 every two years
C)
2 per year
D)
2 every 5 years