Author: Andrew J Stier; Marc G Berman; Luis M. A. Bettencourt
Title: COVID-19 attack rate increases with city size Document date: 2020_3_27
ID: aeminwf0_9
Snippet: A larger reproductive number for spreading processes in larger cities has two important consequences (9) (10) (11) (12) . First, the reproductive number, R, sets a finite threshold for how an epidemic outbreak propagates in a population, just like the branching rate in a chain reaction (13, 14) . For R < 1, an introduced disease will die off because it will be dampened in transmission, while for R > 1, disease transmission will be amplified and r.....
Document: A larger reproductive number for spreading processes in larger cities has two important consequences (9) (10) (11) (12) . First, the reproductive number, R, sets a finite threshold for how an epidemic outbreak propagates in a population, just like the branching rate in a chain reaction (13, 14) . For R < 1, an introduced disease will die off because it will be dampened in transmission, while for R > 1, disease transmission will be amplified and result in an epidemic where the disease is transmitted quickly to almost everyone (see Figure 1B ). Because we expect R ∼ N δ to increase 3 . CC-BY-NC-ND 4.0 International license It is made available under a author/funder, who has granted medRxiv a license to display the preprint in perpetuity.
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