Undernutrition increases the risk of upperrespiratory tract infections and subsequent acute bronchitis, especially in children and older people.
营养不良增加上呼吸道感染的风险从而发生急性支气管炎，特别是儿童和老人。
2
Over 12 weeks in the autumn and winter of 2008, the researchers tracked the number of upperrespiratory tract infections the participants suffered.
在2008年秋冬季超过十二周的的时间里，研究人员跟踪调查了受访者感染上呼吸道疾病的人数。
3
There's no particular bug on the radar this year, but "exposure to other infectious illnesses - colds, upperrespiratoryinfections, influenza" are inevitable.