Sent_en: 2zh While previous studies showed resistance levels below 1%, samples tested by the U.S. Centers for Disease Control and Prevention now showed around 5% resistance, and in a Canadian survey of 81 samples, 8 showed resistance.
Sent_yy: 尽管以前的研究显示抗药性水平低于百分之1，但美国疾病控制和预防中心检测的样本现在显示出约百分之5的抗药性，而在加拿大对81个样本的调查中，有8个样本表现出抗药性。