S: JHSPH – https://www.jhsph.edu/covid-19/articles/achieving-herd-immunity-with-covid19.html (last access: 17 May 2020); WHO – http://www.euro.who.int/en/health-topics/disease-prevention/vaccines-and-immunization/data-and-statistics/infographics/infographic-herd-immunity-fighting-measles-is-a-shared-responsibility-2018 (last access: 17 May 2020).
N: 1. – herd (n): Old English heord “herd, flock, company of domestic animals,” also, rarely, “a keeping, care, custody,” from Proto-Germanic *herdo (source also of Old Norse hjorð, Old High German herta, German Herde, Gothic hairda “herd”), from PIE *kerdh– “a row, group, herd” (source also of Sanskrit śárdhah “herd, troop,” Old Church Slavonic čreda “herd,” Greek korthys “heap,” Lithuanian kerdžius “shepherd”). Of any animals, wild or domestic, from c. 1200; of people, often in a disparaging sense, from c. 1400. Herd instinct in psychology is first recorded 1886.
– immunity (n): late 14c., “exemption from service or obligation,” from Old French immunité “privilege; immunity from attack, inviolability” (14c.) and directly from Latin immunitatem (nominative immunitas) “exemption from performing public service or charge, privilege,” from immunis “exempt, free, not paying a share” (see immune (adj.)). Medical sense of “protection from disease” is from 1879, from French or German.
2. The resistance of a group to [the] spread of an infectious [disease] based on the resistance to infection of a high proportion of individual members of the group.
3. The percentage of immunized people necessary for herd immunity is specific to each infectious disease.
S: 1. OED – https://www.etymonline.com/search?q=herd+immunity (last access: 17 May 2020). 2&3. TERMIUM PLUS – https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-eng.html?lang=eng&i=1&srchtxt=herd+immunity&index=alt&codom2nd_wet=1#resultrecs (last access: 17 May 2020).
SYN: group immunity
S: GDT – http://gdt.oqlf.gouv.qc.ca/ficheOqlf.aspx?Id_Fiche=17492587 (last access: 17 May 2020)
CR: coronavirus, COVID-19, immune system, immunity, pandemic, vaccination, vaccination campaign, vaccine, virus.