Sodalis glossinidius presence in wild tsetse is only associated with presence of trypanosomes in complex interactions with other tsetse-specific factors

Table 1 Summary of the best-fitting GLM models when presence or absence of trypanosomes was considered as the response variable

Model Number	Explanatory variables of best fitting models	Full models		Best Fitting models
Model Number	Explanatory variables of best fitting models	df	AIC	df	AIC
Model 1 (Trypanosoma spp.)	age + subpopulation * sex	44	1464	15	1432.5
Model 2 (T. vivax)	subpopulation + sex * age	44	1212.2	16	1176.3
Model 3 (T. congolense)	sex * S. glossinidius status * age + subpopulation	44	913.4	8	885.35
Model 4 (T. brucei)	subpopulation * sex * age + subpopulation * sex * S. glossinidius status + subpopulation * age * S. glossinidius status and sex * age * S. glossinidius status	44	588.8	42	584.8

A * B interaction between A and B, df degrees of freedom, AIC Akaike Information Criterion, Model 1 showed that only an interaction between subpopulation and sex was significantly associated with the presence of trypanosomes in tsetse flies using post hoc tests, but the associations were different for each species of trypanosomes. Interactions involving subpopulation and various tsetse factors significantly influenced the presence of T. vivax. Interactions between sex and S. glossinidius status were significantly associated with T. congolense status. However, post hoc tests did not resolve which factors were significantly associated with T. brucei status

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