lecture+14+Infectious+Disease

N the overall population and we can rearrange b sl 1

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N (the overall population), and we can rearrange: b *S*L = 1 to yield N T = 1/(b*L) Where N t is the threshold population size. Above that population, the disease will spread; below it, the disease will drop out of the population.
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Modifying Disease Equations dS/dt = b(S + I + R) dS b SI dI/dt = b SI a I dI vI dR/dt = vI dR Modify these equations to represent a disease that is transmitted vertically (individuals who have the disease produce offspring who have the disease at birth) as well as spread person- to-person.
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Conditions favoring the spread of disease Overall, the spread of disease is favored by A large interacting population high transmissibility long duration of disease All of which makes intuitive sense
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Control of Disease We can think about controlling disease through any of these factors: Vaccination and susceptible population size Sanitizers/masks and transmissability Antibiotics and duration
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Overuse of Antibiotics? Does giving antibiotics to animals hurt humans? (USA Today April 20 2012)
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Additional Points Selection for reduced virulence? Importance of host population size, implications for humanity Trade/transport and animal/plant diseases
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N the overall population and we can rearrange b SL 1 to...

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