Transmission, Incubation Period, and Serial
Interval
One patient transmitted the infection to seven
persons, one patient transmitted the infection to
three persons, and four patients transmitted the
infection to two persons each. The incubation
period of confirmed cases was 5.2 days (95%
confidence interval [CI], 1.9 to 14.7) (Fig. 3); distributions
that were fit to our observed data indicated
that 95% of infected patients would have
an onset of symptoms by day 12.4 (95% CI of
95th percentile, 7.3 to 17.5), whereas 5% would
have an onset of symptoms by day 2.2 (95% CI of
5th percentile, 1.2 to 3.1).
We estimated that the serial interval was 7.6
days (95% CI, 2.5 to 23.1) (Fig. 3). The distributions
that were fit to our observed data indicate
that the serial interval was less than 19.4 days in
95% of cases (95% CI of 95th percentile, 11.7 to
27.0) and less than 3.0 days in 5% of cases (95%
CI of 5th percentile, 1.8 to 4.2).