R₀n.

Brit.

/ˌɑːˈnɔːt/,

/ˌɑːˈzɪərəʊ/, U.S.

/ˌɑrˈnɔt/,

/ˌɑrˈnɑt/,

/ˌɑrˈzɪroʊ/,

/ˌɑrˈziroʊ/

Forms:

α. 1900s– R₀, 1900s– R0.

β. 2000s– R-naught (chiefly U.S.), 2000s– R-nought.

γ. 2000s– R-zero.

Origin: Formed within English, by compounding. Etymons: reproduction n., reproductive adj., 0.

Etymology: < the initial letter of either reproduction n. or reproductive adj. + the numerical symbol 0 (see zero n. and adj.).In β. and γ. forms with the number 0 expressed respectively by the words nought n. and naught n., and by the word zero n.

Medicine.

The average number of cases of an infectious disease arising by transmission from a single infected individual, in a population that has not previously encountered the disease. Also called basic reproduction (also reproductive) number. Cf. R n. 13, R number n.

ΚΠ

1982 Science 26 Feb. 1054/3 The ‘intrinsic reproductive rate’ of the disease, R₀, may be defined as the value of R in a disease-free population.

2014 S. B. Majee & G. R. Biswas in S. K. Saxena Trends Infectious Dis. (e-book, accessed 31 Mar. 2020) viii. 194 Since SARS is characterized by low R₀ and low infectiousness prior to clinical symptoms, effective isolation of symptomatic patients can sufficiently control an epidemic outbreak.

2020 StatPearls 20 Mar. (online journal, accessed 31 Mar. 2020) This novel epidemic [sc. COVID-19] doubled about every seven days, whereas the basic reproduction number (R0-R naught) is 2.2.

This entry has been updated (OED Third Edition, September 2020; most recently modified version published online March 2022).

单词	r₀
释义	R₀n. Brit. /ˌɑːˈnɔːt/, /ˌɑːˈzɪərəʊ/, U.S. /ˌɑrˈnɔt/, /ˌɑrˈnɑt/, /ˌɑrˈzɪroʊ/, /ˌɑrˈziroʊ/ Forms: α. 1900s– R₀, 1900s– R0. β. 2000s– R-naught (chiefly U.S.), 2000s– R-nought. γ. 2000s– R-zero. Origin: Formed within English, by compounding. Etymons: reproduction n., reproductive adj., 0. Etymology: < the initial letter of either reproduction n. or reproductive adj. + the numerical symbol 0 (see zero n. and adj.).In β. and γ. forms with the number 0 expressed respectively by the words nought n. and naught n., and by the word zero n. Medicine. The average number of cases of an infectious disease arising by transmission from a single infected individual, in a population that has not previously encountered the disease. Also called basic reproduction (also reproductive) number. Cf. R n. 13, R number n. ΚΠ 1982 Science 26 Feb. 1054/3 The ‘intrinsic reproductive rate’ of the disease, R₀, may be defined as the value of R in a disease-free population. 2014 S. B. Majee & G. R. Biswas in S. K. Saxena Trends Infectious Dis. (e-book, accessed 31 Mar. 2020) viii. 194 Since SARS is characterized by low R₀ and low infectiousness prior to clinical symptoms, effective isolation of symptomatic patients can sufficiently control an epidemic outbreak. 2020 StatPearls 20 Mar. (online journal, accessed 31 Mar. 2020) This novel epidemic [sc. COVID-19] doubled about every seven days, whereas the basic reproduction number (R0-R naught) is 2.2. This entry has been updated (OED Third Edition, September 2020; most recently modified version published online March 2022). < n.1982
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