接种流感疫苗后可起到一定程度的保护作用已为实践证实,但有的地方反映接种该疫苗后照样发生流感。原因何在?疫苗无效常有下列原因: 1.疫苗含有的病毒量减少。病毒量减少多半是被高温灭活,如运输、保存或接种过 Influenza vaccination can play a protective role has been confirmed in practice, but in some places reflect the flu after the vaccination. The reason why? Vaccine often ineffective for the following reasons: 1. The vaccine contains a reduced amount of virus. Most of the virus is reduced by high temperature inactivation, such as transportation, preservation or inoculation