1　药物选择1.1　所选药物的抗菌谱与所感染的微生物应相适应　青霉素的抗菌谱主要是Ｇ+ 球菌 ,链球菌是引起上呼吸道感染的重要病原菌 ,它对青霉素常保持敏感 ,所以宜选用青霉素。其次可考虑用红霉素或第一代头孢菌素 ,不宜用庆大霉素 ,因为链球菌对氨基糖苷类抗生素不敏感 ,? 1 drug selection 1.1 antimicrobial spectrum of selected drugs should be compatible with the infected microorganisms antibacterial spectrum of penicillin is mainly G + cocci, Streptococcus is caused by an important pathogen of upper respiratory tract infection, it is often sensitive to penicillin, it is appropriate to use penicillin . Second, consider using erythromycin or the first generation cephalosporins, not with gentamicin, because streptococcus insensitive to aminoglycoside antibiotics ,?