Group A streptococcus, the primary bacteria causing pharyngitis, have been uniformly susceptible to amoxicillin and have not developed resistance to the penicillins, despite the long-term use of amoxicillin for pharyngitis.

• 组链球菌是引起咽炎的主要细菌，均对阿莫西林敏感，并且尽管长期使用阿莫西林治疗咽炎，它仍没有产生对青霉素的抗药性。