MICRO Epidemiology & Emerging Infectious Diseases

Question 1

Index vs primary vs secondary cases.

Answer 1

Index case – first case in a population.
Primary case – first identified and/or notified case.
Secondary case – cases resulting from subsequent transmission.

Question 2

Incubation period

Answer 2

Period btw exposure to the agent and onset of disease symptoms (case may be infectious during this period).

Question 3

Latent period

Answer 3

Time from infection until infectious period starts.

Question 4

R0

Answer 4

Number of cases one case generates on average over the course of its infectious period, in an otherwise uninfected poplation.

Question 5

R0>1 means that…
R0<1 means that..

Answer 5

Disease increase
Disease decrease
Thus, the larger the R0, the harder to control disease…