Viral infection model with periodic lytic immune response

Viral infection model with periodic lytic immune response
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具有周期性裂解免疫反应的病毒感染模型

DOI:
10.1016/j.chaos.2005.05.003
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发表时间:
2006-04
影响因子:
7.8
通讯作者:
--
中科院分区:
数学1区
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--
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研究了一类病毒感染模型的动力学行为和分支结构。当病毒的基本繁殖比小于或等于1时,无感染平衡点是全局渐近稳定的。当病毒的基本繁殖比大于1时,存在一个非常数周期解。结果表明,随着溶解组分振幅的增大,系统发生倍周期分岔。对于中等出生率,周期三倍发生,然后周期加倍级联逐渐走向混沌周期。当出生率较大时,倍周期级联逐渐向混沌循环发展,而不出现三倍周期现象,并可观察到逆倍周期现象。这些结果可以用来解释慢性HBV或HCV携带者中观察到的病毒群体的振荡行为。
Dynamical behavior and bifurcation structure of a viral infection model are studied under the assumption that the lytic immune response is periodic in time. The infection-free equilibrium is globally asymptotically stable when the basic reproductive ratio of virus is less than or equal to one. There is a non-constant periodic solution if the basic reproductive ratio of the virus is greater than one. It is found that period doubling bifurcations occur as the amplitude of lytic component is increased. For intermediate birth rates, the period triplication occurs and then period doubling cascades proceed gradually toward chaotic cycles. For large birth rate, the period doubling cascade proceeds gradually toward chaotic cycles without the period triplication, and the inverse period doubling can be observed. These results can be used to explain the oscillation behaviors of virus population, which was observed in chronic HBV or HCV carriers.
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