美国Saint Louis大学的研究人员近日在《新英格兰医学杂志》上报道说,初期研究结果表明新型百日咳疫苗的免疫力可使每年数以万计的青少年和成年人有效地预防百日咳。大多数儿童一般可通过幼儿期连续定期接种疫苗来获得抵抗百日咳的免疫力,但随着疫苗的保护性作用在十多年后逐渐减弱,致使青少年和成年人 Researchers at the University of Saint Louis in the United States recently reported in the New England Journal of Medicine that initial findings show that the immunity of the new pertussis vaccine can effectively prevent whooping cough each year by tens of thousands of adolescents and adults. Most children generally achieve immunity against whooping cough by continuous, regular vaccination in early childhood, but as the protective effect of the vaccine declines more than a decade later, adolescents and adults