In the last century there were three major flu pandemics: the Spanish Flu of 1918 (H1N1), believed to have killed over 50 million globally; the Asian Flu of 1957 (H2N2), which caused between 1 and 4 million deaths; and 1968's Hong Kong Flu (H3N2), which took 750,000 lives in Asia.
回首本世紀 3 次大流感── 1918 年西班牙大流感 (H1N1)，估計全球死亡人數超過 5,000 萬；1957 年亞洲大流感 (H2N2)，100-400 萬人死亡；1968 年香港大流感 (H3N2)，亦奪走亞洲 75 萬條人命。