1 Some pathogens have much greater R0 values than others ie

1. Some pathogens have much greater R0 values than others (i.e. Measles R0 = 18 whereas HIV R0 = 4) What factors/traits might lead a pathogen to have a larger R0?

2. Some pathogens can be controlled by vaccination to artificially provide immunity to infection. However, vaccinating wildlife is very different from vaccinating humans, and can be difficult. Give two arguments for and two arguments against vaccinating a wildlife population for a disease of concern.

Solution

Que 1:

Ans:

Some pathogens have much grater RO values than others.Factors that lead a patogen to have a larger RO are:

- RO is the number of people who are expected to be infected by one person who has the disease.

- RO value is affected by several factors including:

a) The duration of infectivity.

b) The infectiousness of the organism.

c) The number of susceptible people with whom the infected patient come in contact.

- In general, if RO is greater than one, the disease will continue to spread within a population.

- If RO is less than one, the disease will eventually disappear from population.

- A long period of infectiousness and high contact rate will contribute to higher RO value.

- The disease that spread most quickly and easily are the ones that can travel through the air, such as the flu or measles have higher RO value than those spread through contact.