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7. Mortality: proportion of the
population that die yearly of the disease and is a product of incidence and the
case fatality rate.
8. Reproductive rate: potential for an infectious disease to spread. Influential factors include the probability of transmission between an infected and a susceptible individual; frequency of population contact; duration of infection; population immune proportion . 9. Vector: source (i.e. mosquito or tick) which harbors infectious agent and transmits it to susceptible individuals. 10. Transmission routes: direct (mucous membrane to mucous membrane, cross placental, blood or tissue, skin to skin, sneezes or coughs) and indirect (water, air borne, food borne, vectors or objects). 11. Reservoir: ecological niche (vs source which is the actual object). 12. Zoonosis: infections that can spread from vertabrate animals to man. |