immunization of cattle against east coast fever using theileria parva (marikebuni) and relaxation of tick control in north rift, kenya. | a total of 90 animals was immunized against east coast fever (ecf) using theileria parva (marikebuni) stock on three large-scale farms in kiminini division, trans-nzoia district, north rift, kenya. another 90 cattle served as non-immunized controls. following immunization the number of cattle with significant indirect fluorescent antibody (ifa) titres increased from 43.9% to 84.4% and 6.7% of the cattle developed clinical ecf reactions. two months after immunization, the immunized and non-immuni ... | 2001 | 11769354 |