Table 5. Factors influencing Toxoplasma gondii oocyst-based transmission in terrestrial and aquatic environments.

Oocyst loading	Oocyst survival	Transport of oocysts overland and in waterways
Distribution of wild and domestic felids Human land use and available habitat Habitat preferences Distribution of prey species Human management of felid populations	Terrestrial conditions: Soil chemistry and moisture Air temperature and humidity	Felid defecation behavior: Depth of burying Proximity of oocyst deposition to waterway
	Felid defecation behavior: Depth of burying	Chemical and physical surface properties of oocysts
Prevalence and frequency of oocyst shedding in wild and domestic cats Felid diet (number and type of prey) Prevalence of T. gondii infection in prey Exposure to oocysts in the environment	Aquatic conditions: Water temperature	Terrestrial conditions: Watershed size and slope Vegetation Substrate (Permeable or impervious surfaces)
		Precipitation patterns: Quantity, intensity, frequency, and duration
Duration and quantity of oocyst shedding by wild and domestic felids		Aquatic conditions: Water chemistry and quality Vegetation Flow rate