In this paper, we first present a stochastic model of the proportion of the population infected with HIV against total population, and prove the existence and uniquess of its solution. Through computer simulation, we forecast the proportion of the population infected with HIV against the total population in the transmission course of AIDS in China in next 20 years. Especially, we study the control index of the transmission rate
to obtain its effect on the epidemic trend of AIDS when it fluctuates. As such, we present a strategy to adjust
to reach a certain control aim based on the analysis of the mean value and variance of the proportion.
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