This is almost certainly what happened to the Spanish flu strain, and I should stress almost.

几乎可以肯定这就是发生在西班牙流感毒株上的事情，我应该强调一下。

That can be because they got their flu shot, or maybe because they’ve already had that flu strain.

那可能是因为他们注射了流感疫苗， 也许是因为他们已经得过流感。

That flu vaccine could even be specifically tailored to the flu strain that's circulating in that local area.

这种流感疫苗甚至可以专门针对在该地区流行的流感毒株量身定制。

A truly universal flu vaccine would be able to protect against current flu strains and future drifted or shifted strains.

真正通用的流感疫苗将能够预防当前的流感毒株和未来漂移或转移的毒株。

Skinner says the vaccine many people received for this year's flu strains may not have been 100% effective but has helped reduce the severity of the illnesses.

斯金纳表示今年许多人接受了疫苗接种，虽然不一定100%奏效，但可以有效减轻病症程度。

This effect is due to an outsize " immune imprinting" , probably by the flu strain in global circulation in the year after they were born.

这种影响是由于超大的“免疫印记” 造成的，可能是由他们出生后一年内全球流行的流感病毒引起的。

Using historical data on seasonal flu strains, Dr Worobey's team estimates that most people born before 1968 may have this type of immune protection against H5N1.

Worobey 博士的研究小组利用季节性流感病毒株的历史数据估计，大多数 1968 年之前出生的人可能具有这种针对 H5N1 的免疫保护能力。

Even when flu strains mutate further, the vaccine is often close enough that a vaccinated person who catches the flu anyway will have a milder and shorter illness than they would otherwise.

即使当流感毒株进一步变异时，疫苗通常也足够接近，以至于无论如何都会感染流感的接种疫苗的人会比其他人患上更轻、更短的病。