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

We report mean severe acute respiratory syndrome coronavirus 2 serial intervals for Montana, USA, from 583 transmission pairs; infectors symptom onset dates occurred during March 1-July 31, 2020. Our estimate was 5.68 (95% CI 5.27-6.08) days, SD 4.77 (95% CI 4.33-5.19) days. Subperiod estimates varied temporally by nonpharmaceutical intervention type and fluctuating incidence.

Automated summary

The mean serial interval for SARS-CoV-2 in Montana, USA was estimated to be 5.68 days, with a standard deviation of 4.77 days. The estimates varied temporally based on the type of nonpharmaceutical interventions and fluctuating incidence.