The population of Aedes mosquitoes which carry the Dengue virus can be modeled by a differential equation which describes the rate of growth of the population. The population growth rate dP/dt is given by dP/dt = rP(1-P/k) , where r is a positive constant and k is the carrying capacity.
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RGR is the relative growth rate. When r is small and the population is small, the growth rate is small (slow), but is gradually increasing until the carrying capacity is reached.

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