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. 2016 Jul 7;9:390. doi: 10.1186/s13071-016-1666-3

Table 3.

Suite of models considered in Stage 2 and Stage 3 to estimate probability of hematozoa infection (Ψ)

Model K Model description
Stage 2 – Co-infection modelsa
 Stage 1 0 pr (infection) varies by top supported model structure from Stage 1
 Haem 1 pr (infection) varies by Stage 1 and by co-infection with Haemoproteus parasites
 Leuc 1 pr (infection) varies by Stage 1 and by co-infection with Leucocytozoon parasites
 Plas 1 pr (infection) varies by Stage 1 and by co-infection with Plasmodium parasites
 IAV 1 pr (infection) varies by Stage 1 and by co-infection with Influenza A Virus
 Serostatus 1 pr (infection) varies by Stage 1 and by Influenza A Virus serostatus
Co-infection variation
 * month 3 pr (infection) varies by Stage 1 and by co-infection differently for each month
 * species 5 pr (infection) varies by Stage 1 and by co-infection differently for each duck species
 * age 2 pr (infection) varies by Stage 1 and by co-infection differently for each age class
 * sex 2 pr (infection) varies by Stage 1 and by co-infection differently for each sex class
Stage 3 – Body condition models
 Stage 2 0 pr (infection) varies by top supported model structure from Stage 2
 BCI 1 pr (infection) varies by Stage 2 and by body condition
 BCI * month 3 pr (infection) varies by Stage 2 and by body condition effect that is different for each month
 BCI * species 5 pr (infection) varies by Stage 2 and by body condition effect that is different for each species
 BCI * age 2 pr (infection) varies by Stage 2 and by body condition effect that is different for each age class
 BCI * sex 2 pr (infection) varies by Stage 2 and by body condition effect that is different for each sex class

Models were considered independently for each of three hematozoa genera (Leucocytozoon, Haemoproteus, Plasmodium) and were applied only to estimation of Ψ. K = number of model parameters in addition to those supported in the previous stage of model selection and BCI is the body condition index

aEach co-infecting agent was considered alone, and varying multiplicatively with co-infection variation structures