秋季是流行性感冒(简称流感)的高发季节,因此被人们称为“流感季”。因为病毒不断变异,科研人员不得不每年针对上一季的主要流感病毒,推测出下一季可能爆发的病毒种类,然后研制出只适用于该季的流感疫苗,投入大量人力物力,有时还未必奏效。而且,由于大多数疫苗是在鸡蛋黄和细胞内培养而成的,因此至少需要六个月的时间才能出成品。这 Autumn is the high season for influenza (referred to as flu), so it is known as the “flu season.” Because of the ever-changing virus, researchers have to predict the types of viruses that may break out in the next season against the major influenza viruses of the previous season every year, and then develop a flu vaccine that only applies to the season, putting a lot of manpower and resources into practice, sometimes failing to work. And, since most vaccines are cultured in egg yolk and cells, it takes at least six months to produce the finished product. This