Table 3. Akaike information criterion (AIC) values and other model selection metrics for molecular case series linear models using information theoretic approaches [29].

Model	Parameters (K)	Bias corrected AIC (AICc)	AICc differences (Δ)	Relative likelihood (evidence ratio)	Probability (Akaike weight)
Host immunity	6	339132.1	0.0	0.98	0.580
Resource driven contact	11	339132.7	0.6	1.0	0.420
Environmental contamination	8	339218.0	85.9	4.4×1018	0.000
Genetic relatedness model	5	339284.7	152.6	1.4×1033	0.000
Density dependant	7	339735.4	603.3	1.0×10131	0.000

The probability of both the resources and host immunity models is high rather than the other hypothesised mechanisms of transmission. Models are listed in AIC ranked order for each study design.