疫苗从出厂到接种的冷链的每一阶段均应保存在2～8℃(脊髓灰质炎疫苗为0～4℃),否则疫苗(尤其是活疫苗)的效果可能受损。在热带国家已认识到冷链的重要性,但在温带国家尚不太重视。匈牙利的调查表明,疫苗在运输期间受热,且冷冻设备不足。 Vaccines should be stored at 2 to 8 ° C (polio vaccine 0 ° C to 4 ° C) at each stage of the cold chain from the factory to the vaccination, otherwise the effectiveness of the vaccine (especially live vaccines) may be impaired. The importance of cold chains has been recognized in tropical countries, but not too much in temperate countries. A Hungarian survey showed that the vaccine was heated during transport and there were insufficient refrigeration equipment.