In terms of the scaled variables, these initial conditions are s(0) = 1 2 Thus, our initial values for the population variables are S(0) = 7,900,000 We will assume that there was a trace level of infection in the population, say, 10 people. For this particular virus - Hong Kong flu in New York City in the late 1960's - hardly anyone was immune at the beginning of the epidemic, so almost everyone was susceptible.
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