百日咳的严重性主要在于痉咳。抗菌素和免疫球蛋白在早期应用可能有效,现在发现,当频繁的痉咳发展到不能控制时,维生素K_1疗效明显。最初使用的是合成维生素K,后来因为小儿大量 The severity of whooping cough is mainly spasm cough. Antibiotics and immunoglobulins may be effective in early applications, and now found that when frequent spastic cough can not control the development of vitamin K_1 obvious effect. The initial use of synthetic vitamin K, and later because of large amounts of children