Basic reproductive number Certification Review Exam Questions And Answers.
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Course
RP.
Institution
RP.
How is Ro used to measure disease transmission? - correct answer Ro is the measure of how many individuals will develop the disease should they come into contact with an infectious individual. If the Ro <1 then the infection dies out, if the Ro = 1 t...
How is Ro used to measure disease transmission? - correct answer Ro is the
measure of how many individuals will develop the disease should they come into contact with an
infectious individual. If the Ro <1 then the infection dies out, if the Ro = 1 then the infection is endemic,
Ro>1 then the infection becomes an epidemic.
How is Ro calculated? - correct answer (Infection/contact) x (contact/time) x
(time/infection)
More specifically
R0 = t · ¯c · d
t=is the transmission probablity which means the probablity a susceptible person (one yet to develop
disease) will develop infection when in contact with an infectious person
¯c=rate of contact between susceptible and infectious person
d=duration of infection
How can we use the eqn to think about factors affecting Ro? - correct answer
We can look at the eqn in 2 and assess how different factors would relate to disease transmission. Take
rate of contact between individuals this may be affected by route is the disease air borne or passed on
by more direct physical contact.
Possibility of transmission can be affected by the route as well. Possibility of transmission can relate to
non human contact with infection such as vectors, fomites and vehicle borne transmission.
Duration of infection can affect disease transmission because if an individual is infectious for longer
particularly if the infection is latent they are more likely to pass it on.
How does the number of susceptibles effect Ro? - correct answer The number
of susceptibles decrease either through development of immunity or death. If a disease is one where it
is possible to recover
How do the factors that need to be considered to calculate Ro differ between infectious diseases? -
correct answer Transmission route determines how Ro is calculated for
example vector borne disease the contact rate between the vector and the human needs to be
considered. In for example malaria the biting rate of the mosquito needs to be considered.
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