The reinfection threshold does not exist.
Breban
Romulus
R
Blower
Sally
S
D003140:Communicable Disease Control; D003141:Communicable Diseases / Q000453:epidemiology*; D004196:Disease Outbreaks; D004198:Disease Susceptibility; D006801:Humans; D008954:Models, Biological; D012008:Recurrence; D014611:Vaccination