Disease is spread faeco- orally. Oocyts from ewes (immune carriers) accumulate in poorly managed litter or around feed and water troughs. Lambs born early in the year amplify the parasite problem increasing the parasite risk to lambs born later in the year. This is because there is a high number of oocysts deposited by newly infected animals. | Disease is spread faeco- orally. Oocyts from ewes (immune carriers) accumulate in poorly managed litter or around feed and water troughs. Lambs born early in the year amplify the parasite problem increasing the parasite risk to lambs born later in the year. This is because there is a high number of oocysts deposited by newly infected animals. |