seasonal strain的意思|示意

After preliminary investigations, it was concluded this month that the cause is not seasonal influenza but rather an entirely new hybrid strain composed of pig, bird and human viruses.

初步调研后的结论表示，这些病症并非季节性流感所致，而是因为一种由猪、鸟、人类病毒组成的全新杂交病毒链。

In general, it's not necessary for you to know whether your flu is H1N1 or a seasonal strain.

一般而言，你无须知道你的流感是H1N1还是季节性流感。

However, most people have no immunity to this virus, which means that more are likely to become infected than with a seasonal strain of influenza.

然而，大多数人对此病毒没有免疫性，这意味着比季节性流感株更容易感染。