Estimating the values of Infectivity, pathogenicity and virulence.
Disease X is one that often results in severe illness, but never is fatal. On March 21, 1990, 30 students developed disease X among all students in an introductory epidemiology course at a university. (Assume all epidemiology students were exposed to the index case, the instructor.) Through antibody titers we were able to determine the following:
a. # of exposed students not infected = 40
b. # of exposed students with subclinical infection = 10
c. # of exposed students with mild symptoms = 10
d. # of exposed students with moderate symptoms = 10
e. # of exposed students with severe symptoms = 10
Using your knowledge of infectious disease epidemiology, quantify the pattern of disease X in this group, that is what the infectivity, pathogenicity, are and virulence of disease X?