(一) 百日咳是小兒習見的傳染病之一,五歲以下的兒童最易戚染,这是兒科病中比較痛苦和缠绵的一种病症。由於它很容易引起併發症——如間質性肺炎、毛細管炎、支气管炎、肺气腫、肺萎陷等,预后很是可慮,年齡越小,危險性越大,不足一歲的嬰兒患此症者,死亡率較高,一般達25%之多不满三月之幼嬰、死亡率竟達50%。这种病的病源,是百日咳桿菌,目前最有效的預防方法,是隔离病兒,杜絕傳染的机会,但患者於染病初期,都無特殊病狀,卽發展到第二期,其症狀表現也多与感冒相似,仍能自 (i) Whooping cough is one of the common infectious diseases in children. Children under the age of five are most likely to be infected. This is a more painful and lingering illness in paediatric diseases. Because it is very easy to cause complications - such as interstitial pneumonia, capillary inflammation, bronchitis, emphysema, lung collapse, etc., the prognosis is very conceivable, the younger the age, the greater the risk, less than one year old baby People suffering from this disease have a high mortality rate. Generally, as many as 25% of infants who are dissatisfied with their babies in March have a mortality rate of 50%. The source of this disease is Bordetella pertussis. Currently, the most effective prevention method is to isolate sick children and eliminate the chance of infection. However, at the initial stage of infection, patients have no special symptoms. The development of the disease to the second stage has its symptoms. More like a cold, still able to