The current vaccines have four viruses: two influenza A, and two influenza B. And it may or may not work.

两种甲型流感和两种乙型流感。它可能起作用，也可能不起作用。

But they're warning about another type of the flu called influenza B. At this time, those viruses are more frequently being reported in America.

同时他们还对另一种B型流感病毒发布警告。在这个时候，美国会更频繁的播报各种病毒。

Flu diagnoses take some by surprise, and there are two different kinds you need to understand: influenza A and influenza B. Other people get diagnosed with " flu-like illness, " which can also be a confusing term.

流感诊断出人意料，您需要了解两种不同类型：A 型流感和 B 型流感。其他人被诊断出患有“流感样疾病”，这也是一个容易混淆的术语。