| 单词 | herd immunity |
| 释义 | > as lemmasherd immunity herd immunity n. resistance to the spread of a contagious disease within a population (in earliest use, a herd of cattle) that results if a sufficiently high proportion of individuals are immune to the disease, typically as a result of having been vaccinated against it; an instance of this. ΚΠ 1917 A. Eichhorn & G. M. Potter Contagious Abortion of Cattle (U.S. Dept. Agric. Farmers' Bull. No. 790) 9 A herd immunity seems to have developed as the result of keeping the aborting cows and raising the calves. 1927 Brit. Med. Jrnl. 21 May 925/2 Diphtheria prevalence among close-quartered families may be held in check by the ‘herd’ immunity, induced by minimal doses of infection. 2019 Birmingham Evening Mail (Nexis) 13 July 16 The World Health Organisation recommends a threshold of 95 per cent immunization coverage to achieve so-called 'herd immunity' [against measles]. < as lemmas |
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