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The Delta and Omicron variants have the pooled estimates of serial interval as 3.4 days (95% CI: 3.0, 3.7) and 3.1 days (95% CI: 2.9, 3.2), respectively; incubation periods as 4.8 days (95% CI: 3.9, 5.6) and 3.6 days (95% CI: 2.3, 4.9), respectively.
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Du et al. (2022) studied this question.
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