目前,工业化国家反对疫苗接种的呼声日益增多,原因之一是儿童接种的疫苗太多。儿童入学前常常需要预防接种15针疫苗,如增加口服脊髓灰质炎疫苗的接种,且此后还要接种更多的疫苗。2000年春天,美国推广一种肺炎球菌结合疫苗,从而导致大多数儿童在每次就诊时免疫接种5种不同疫苗的状况。 At present, one of the reasons why industrialized countries oppose vaccination is increasing. One of the reasons is that too many vaccinations are given to children. Pre-school immunizations often require 15-dose vaccinations, such as increasing oral polio vaccination, and more vaccinations thereafter. In the spring of 2000, the United States promoted a pneumococcal conjugate vaccine that resulted in most children immunized with five different vaccines at each visit.