Toxoplasmosis: The possibility of vertical transmission

The consensus view is that ovine toxoplasmosis results from a primary infection in pregnant sheep, following ingestion of sporulated oocysts contaminating the environment. Recent research has suggested that vertical transmission from persistently infected ewes to the foetus occurs more frequently than previously thought. Our studies fully support the consensus view, although it may be that in exceptional circumstances vertical transmission can occur with greater frequency. © 2005 Elsevier B.V. All rights reserved