For the Spanish flu of 1918-19, this was about 2.5 per cent, while for the 1968 pandemic it was below 0.5 per cent. This explains the huge difference in the death tolls.

对于1918 - 1919年西班牙的流感来说，这一数字是2.5%，1968年的大疫情这一数字为0.55 .这也就说明了死亡率的巨大差别。

youdao

Comparing the recent outbreak of swine flu to the influenza epidemic of 1918-19 May seem premature.

把近期的猪流感和1918——1919年的流感相比可能为时过早。

youdao

If he's right, it is possible the second, winter wave of 1918 flu was more deadly not because of viral evolution but because bacterial infections are more common in winter.

如果他的假设正确，则在1918年冬天爆发的第二波流感变得更加致命的原因很可能不是因为病毒的演变而是因为细菌感染在冬季更加常见。

youdao

This is welcome news for U.S.health officials, who initially had to consider the possibility that the new flu strain's impact could mirror the devastation of the 1918 influenza pandemic that led to tens of millions of deaths worldwide.

VOA: standard.2009.05.03

The Spanish flu of 1918 may have killed more people than the first world war.

ECONOMIST: A new virus worries a twitchy world

As a comparison, the Spanish flu of 1918, in which 40 million people died, had only about 2-3 % kill-rate.

FORBES: Why One Great Vaccine Researcher Wasn't Afraid Of Bird Flu

We exchanged letters every Christmas until he passed away in the flu epidemic of 1918.

NPR: Excerpt: 'True Grit'