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“我们需要至少 70% 至 80% 的儿童接种这种疾病的疫苗,以控制感染人数。一旦疫苗接种率低于这个数字,我们就有可能看到这些疾病再次卷土重来,而这些疾病在过去几十年里在加拿大几乎已经被根除。”儿科医生兼 Kidcrew 创始人 Dina Kulik 博...