美国流感病例超过1500万,引发了健康警告。 Flu cases in the U.S. exceed 15 million, prompting health warnings.

美国的流感活动正在增加,疾控中心报告,本季迄今至少有1 500万例流感病例。 Flu activity in the United States is rising, with the CDC reporting at least 15 million cases so far this season. 这一增加标志着全国感染人数继续呈上升趋势,促使卫生官员敦促接种疫苗和采取预防措施。 The increase marks a continued upward trend in infections across the country, prompting health officials to urge vaccination and preventive measures.