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Volume 27, Number 5—May 2021
Dispatch

SARS-CoV-2 Serial Interval Variation, Montana, USA, March 1–July 31, 2020

Isaiah G. ReedComments to Author , Ethan S. Walker, and Erin L. Landguth
Author affiliations: Montana Department of Public Health and Human Services, Helena, Montana, USA (I.G. Reed); University of Montana, Missoula, Montana, USA (E.S. Walker, E.L. Landguth)

Main Article

Table 1

Published mean serial interval estimates for severe acute respiratory syndrome coronavirus 2*

Publication† Study location, dates 
(all in 2020 except as indicated) No. cases (pairs) SI mean (95% CI) SI SD (95% CI) SI estimate
method
This study Montana, USA, Mar 1–Jul 31 4,793 (583) 5.68 (5.27–6.08) 4.77 (4.33–5.19) Forward
Prete et al., 2020 (13)‡ Brazil, Feb 25–Mar 19 NA (65) 2.97 3.29 Other
Talmoudi et al., 2020 (14)‡ Tunisia, Feb 29–May 5 NA (491) 5.30 (4.66–5.95) 0.26 (0.23–0.30) Other
Lavezzo et al., 2020 (15) Vo’, Italy, Feb 21–Mar 7 81 (41) 7.2 (5.9–9.6) NA Other
Aghaali et al., 2020 (16) Qom, Iran, Feb 20–Mar 8 88 (37) 4.55 3.30 Forward
You et al., 2020 (17)‡ China (OHP), as of Mar 31 14,828 (198) 4.60 5.55 Intrinsic
Ali et al., 2020 (1)‡ China (OHP), Jan 9–Feb 13 9,120 (677) 5.1 (4.7–5.5) 5.3 (5.0–5.6) Forward
Zhang et al., 2020 (18) China (OHP), Jan 19–Feb 17 8,579 (35) 5.1 (1.3–11.6) NA Forward
Du et al., 2020 (10)‡ China (OHP), Jan 21–Feb 8 752 (468) 3.96 (3.53–4.39) 4.75 (4.46–5.07) Backward
Liao et al., 2020 (19) China (CTGCH), Jan 7–Mar 20 46 (12) 6.50 (2.45–17.38) NA Forward
Zhao et al., 2020 (20) Hong Kong, Jan 16–Feb 15 56 (21) 4.9 (3.6–6.2) 4.4 (2.9–8.3) Other
Chan et al., 2020 (21) Hong Kong, Jan 23–Apr 6 915 (47) 6.5 (0–18) 4.7 Unknown
Bi et al., 2020 (22) Shenzhen, China, Jan 14–Feb 9 391 (48) 6.3 (5.2–7.6) 4.2 (3.1–5.3) Other
Wang et al., 2020 (23) Shenzhen, China, Jan 19–Feb 22 417 (27) 5.9 (3.9–9.6) 4.8 (3.1–10.1) Other
Ganyani et al., 2020 (24)‡ Tianjin, China, Jan 14–Feb 27 135 (NA) 3.95 (–4.47 to 12.51) 4.24 (4.03–4.95) Other
Tindale et al., 2020 (25) Tianjin, China, Jan 21–Feb 22 135 (72) 4.31 (2.91–5.72) 0.716 Forward
Li et al., 2020 (26) Wuhan, China, as of Jan 22 425 (6) 7.5 (5.3–19.0) 3.4 Other
Ganyani et al., 2020 (24)‡ Singapore, Jan 21–Feb 26 91 (NA) 5.21 (–3.35 to 13.94) 4.32 (4.06–5.58) Other
Tindale et al., 2020 (25) Singapore, Jan 23–Feb 26 93 (56) 4.17 (2.44–5.89) 0.882 Forward
Ki et al., 2020 (27) South Korea, Jan 10–Feb 10 28 (12) 6.6 (3–15) NA Unknown
Mettler et al., 2020 (12)‡ South Korea, Jan 20–Jun 30 5,201 (102) 3.43 (2.62–4.24) NA Forward
Chun et al., 2020 (28)‡ South Korea, Jan 23–Mar 31 9,887 (69) 3.18 (2.22–4.24) 0.75 (0.47–1.03) Forward
Son et al., 2020 (29) Busan, South Korea, Feb 21–Mar 24 108 (28) 5.54 (4.08–7.01) 3.90 (2.47–5.32) Other
Nishiura et al., 2020 (30) Meta-analysis, 2019 Dec 21–2020 Feb 12 NA (28) 4.7 (3.7–6.0) 2.9 (1.9–4.9) Other
He et al., 2020 (11)‡ Meta-analysis, Jan 21–Feb 12 NA (77) 5.8 (4.8–6.8) NA Other

*All articles published during 2020 except this study. CTGCH, Chongqing Three Gorges Central Hospital; NA, not available; OHP, outside Hubei Province; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; SI, serial interval.
†See References and Appendix for full publication information.
‡Study included negative-valued serial interval pairs in the estimate.

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References
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Page created: March 09, 2021
Page updated: April 22, 2021
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