Modelling the spread of infectious disease

Use the following formula to explore how different variables affect the rate of spread of a disease.

Ro = (t N) / (a + b + c)

where,
Ro = rate of new infections (rate of spread of disease)
t = transmissibility (how easy it is for the pathogen to transmit between individuals who interact)
N = number of interactions among individuals that could potentially result in transmission
a = rate of death due to infection (virulence)
b = rate of death due to other causes
c = rate of recovery

t =
N =
a =
b =
c =
R0 =

Choose the correct answer to each question below.

What happens to the rate of spread of the pathogen (Ro ) as t (transmissibility) increases?
Ro increases
Ro decreases
Ro stays the same

as N (number of interactions) increases?
Ro increases
Ro decreases
Ro stays the same

as a (rate of death due to infection) increases?
Ro increases
Ro decreases
Ro stays the same


More questions...


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