Work out serial interval estimate instantly with clear inputs, formula shown and shareable results.
Averages the observed intervals between symptom onset in infector-infectee pairs, the empirical estimate of the serial interval.
Serial interval
Mean serial interval = sum of onset-to-onset intervals / number of pairs; the standard deviation measures its spread
The generation interval measures infection-to-infection times, which are unobservable; the serial interval uses symptom onset as a proxy.
Yes, when pre-symptomatic transmission means the infectee develops symptoms before the infector.