Disease assessment based on average coefficient of infection (ACI) according to Ref.
[40] was used by multiplying disease severity (DS) by constant values of infection type (IT).
The constant values for infection types were used, where R = 0.2, MR = 0.4, MS = 0.8 and S = 1.0. Infection types were scored according to Ref.
[37]. Disease severity (DS) was estimated as