Characteristics of the samples used in each part of the study.

aImmune status is undetermined when the interval between admission and hospital discharge is b non-severe dengue corresponds to dengue fever (DF) according to the 1997 guidelines and to DF without warning signs according to the 2009 WHO guidelines. Severe dengue corresponds to dengue hemorrhagic fever (DHF) and DSS (dengue shock syndrome) according to the 1997 guidelines and dengue with warning signs and severe dengue according to the 2009 WHO recommendations.Characteristics of the samples used in each part of the study.当入院与出院的间隔时间为b时，免疫状态（immune status）尚未明确。非重症登革热：依据1997版指南，其对应登革热（DF，dengue fever）；依据2009年世界卫生组织（WHO）指南，其定义为无预警体征的登革热。重症登革热：依据1997版指南，其对应登革出血热（DHF，dengue hemorrhagic fever）与登革休克综合征（DSS，dengue shock syndrome）；依据2009年世界卫生组织推荐方案，其定义为伴有预警体征的登革热及重症登革热。本研究各部分所用样本的特征。