Analysis of deviance table of logistic regression of proportion of EAI4-VNM isolates as a function of age and sex of the patient, location (urban vs. rural), and sampling (hospital vs. population).

*: Estimates, deviance and their p-values are calculated by correcting for possible confounding effects of all the other explanatory variables. (see Materials and methods).*：估计值、偏差统计量（deviance）及其p值均通过校正其余所有解释变量可能存在的混杂效应计算得到（详见材料与方法部分）。