Table 1.

Inclusion and exclusion criteria for the selection of eligible studies for a systematic review on Toxoplasma gondii seroprevalence in domestic pigs, sheep, cattle, wild boars and moose in the Nordic-Baltic region.

Inclusion criteria	Exclusion criteria
All studies (journal articles, theses, reports, scientific article manuscripts) on T. gondii seroprevalence published between 1990 and 2018 (except manuscripts, unpublished at inclusion)	Studies on T. gondii seroprevalence published before 1990
Samples (blood and meat juice) collected between 1990 and 2018	Samples collected before 1990
All languages
Countries from the Nordic and Baltic region i.e., Denmark including the Faroe Islands and Greenland, Finland including the Åland Islands, Iceland, Norway, Sweden, Estonia, Latvia, and Lithuania	Countries outside the Nordic-Baltic region
Domestic pigs (Sus scrofa domesticus), sheep (Ovis aries), cattle (Bos taurus), wild boars (Sus scrofa) and moose (Alces alces)	All other host species
Seroprevalence studies conducted at animal-level	Herd-level seroprevalence studies
Cross-sectional, cohort and unstructured study designs to estimate T. gondii seroprevalence in apparently healthy animals Access to the full text of the study for data extraction	Experimental studies