病房环境条件对空媒传播疾病感染风险的影响

为了研究病房内各种参数对空媒传播疾病的影响,利用浓度衰减方程和Wells-Riley方程研究分析了通风量、易感染人员数量、病房尺寸等参数与空媒传播疾病感染风险的关系.分析结果显示：增加病房内的通风量可以有效地降低空媒传播疾病的感染几率;对于换气次数相同但面积不同的2个病房而言,大病房的通风量大于小病房的通风量;换气次数相同时,病房内的感染人数随易感染人员数量的增加而增加.因此,病房内所需的通风量不仅与换气次数（ACH）有关,还与病房面积和病房内易感染人员数量有关.

Influence of environmental conditions on airborne infection risk in ward

In order to study the influence of parameters on airborne transmitted diseases in a hospital ward,a pollutant decay equation and a Wells-Riley model are adopted to study the relationship between the airborne infection risk and the parameters such as the ventilation rate,the number of susceptible persons and the volume of the ward.The results show that the airborne infection risk can be reduced by increasing the ventilation rate.For two wards with the same air change per hour（ACH）but different volumes,the ventilation rate in a large room is higher than that in a small one.The number of the infected persons in the ward increases with the increase in the susceptible persons when the ACH is a constant.Therefore,the ventilation rate in the ward is not only estimated by the ACH but also related to the volume of the ward and the number of the susceptible persons.