Q2] can transmit the disease but who exhibit no overt symptoms. Let r and y denote the proportions o susceptibles and carriers, respectively, in the population. Suppose that carriers are identified and removed from the population at a rate B, so Some diseases (such as typhoid fever) are spread largely by carriers, individuals who dy/dt = -By. (1 Suppose also that the disease spreads at a rate proportional to the product of r and y; thus

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