Clinical and laboratory studies on theileriosis outbreaks in Sicily, Italy.
153 blood samples were collected from 15 Sicilian farms. 29.4 and 25.5% were PCR positive for Theileria annulata and T. buffeli/orientalis respectively. 15.7% of cattle blood samples showed a mixed infection with both Theileria species. Each farm showed an infection rate ranging from 0 to 100%. Hyalomma marginatum and Boophilus annulatus were the most common ticks collected in April and November 1998 respectively. Tick vectors involved in transmission, distribution, risk areas and seasonality, and healthy carriers, are also discussed.