Word: hk
(lookup in dictionary)
(lookup stats)
Dates: during 1970-1979
Sort By: most recent first
(reverse)
...cause of Europe's vulnerability to HK-68 was its lack of what epidemiologists call "herd immunity." Unlike North America, virtually the entire Continent (aside from European Russia) got off lightly last winter. Relatively few Europeans developed either flu or the substantial natural immunity that the grippe confers against a later bout of disease from the same virus. So most Europeans remained susceptible, and they have made little use of the available vaccines...