An SEIRS model having infectious force in the latent period is discussed in this paper, the conditions and threshold to the existence of various equilibriums are established.
本文讨论了一类含潜伏期传染的SEIRS模型，确定了各类平衡点存在的条件阈值。
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Aim Dynamical behavior of a kind of nonlinear SEIRS model of epidemic spread with the saturated rate, which has infective force in both latent period and infected period, is studied.