急性上呼吸道感染是最常见的一种呼吸道传染病,常由病菌引起,少数由细菌引起。不同的年龄、性别,以及生活在不同地区、从事不同职业的人均可患病,一年四季皆可发病,以冬季多发,多为散发,气候突变时可以流行。病毒类型较多,人体对各种病毒感染后产生的免疫力较弱且短暂,常无交叉免疫,故一人可多次发病。急性上呼吸道感染是指鼻腔、咽或喉部急性炎症的 Acute upper respiratory tract infection is the most common type of respiratory disease, often caused by bacteria, a small number caused by bacteria. People of different ages, genders and living in different regions and in different occupations can get sick. The disease can occur all year round, with many in winter and mostly distributed, which can prevail when the climate is abrupt. More types of viruses, the human body after a variety of viral infections generated weak and short-lived, often without cross-immunization, so one person may be multiple incidences. Acute upper respiratory tract infection is the acute inflammation of the nose, pharynx or larynx