Transmission parameters for outbreaks of avian influenza H5N1 infection.

aMean number of secondary cases infected by a single index case in an exposed population of size 5, CI denotes confidence interval.bMean number of zoonotic cases in an exposed population of size 5.cAICC denotes Akaike Information Criterion adjusted for small sample size. This indicates the percent probability that the model is the best amongst those considered.