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中文摘要：
建立并分析了一个带有脉冲出生、垂直传染和时滞的SEIS传染病模型．利用频闪映射得到了无病周期解的存在性，并得到了两个临界值R＊和R＊，当R＊〈1时，无病周期解全局吸引，疾病消失；当R＊〉1时，疾病持续．
英文摘要：
In this paper, tion is investigated . Using the the exact infection-free periodic R＊ 〈 1, the disease will die out a delay SEIS epidemic model with birth pulse and vertical infecdiscrete dynamical system determined by the stroboscopic map, solution is obtained. We also obtain two thresholds R＊ and R.,if whereas if R＊ 〉 1, the disease will be permanent.
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