dates of symptom onset
contact data: exposure (who infected you?) and contact tracing (who could you have infected?)
dates of exposure / infection
dates of outcome: death / recovery
metadata on patients: age, gender, location, occupation, etc.
data from past outbreaks
Disease-dependent, but generally includes:
Definition: time interval between the date on infection and the date of symptom onset
Definition: time interval between onset of symptoms in primary and secondary cases.