流感疫苗只对由某种病毒引起的流行性感冒有预防作用。流感的症状比较重,持续高烧一周,浑身肌肉疼、关节疼,免疫力低的人得了流感还会引起并发症。流感病毒变异快,每年都不同,因此,即使接种了流感疫苗,也有可能得上由变异了的病毒引起的流感。流感疫苗并不预防普通感冒,普通感冒由多种病毒、细菌引起,无法预防,人一般在天气忽冷忽热、 Influenza vaccines are only prophylactic against the influenza caused by a certain virus. Flu symptoms are more severe, sustained a high fever for a week, whole body muscle pain, joint pain, low immunity people have flu can cause complications. Influenza viruses mutate rapidly and vary from year to year, so flu vaccines are likely to catch the flu caused by the mutated virus. Flu vaccine does not prevent the common cold, the common cold caused by a variety of viruses, bacteria, can not be prevented, people are generally hot and cold weather,