Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1998.389.391AkhtarMasood Sultan Ayaz C.S. Hayat M. Ashfaque 4199814Immune response of sonicated coccidiai oocyst was observed in chickens. Indirect haernagglutination (INA) test was developed for detecting antibodies to coccidia and serum antibody levels were measured against soluble oocyst (sporulated) antigen. IHA antibody titre was significantly higher (p<0.05), in chicks vaccinated with inactivated sonicated vaccines as compared to the chicks vaccinated with inactivated sporulated vaccine. The IHA antibody titre vaccinated with inactivated sonicated vaccine ranged from 1 : 64 to 1 : 1:512, among the 15 samples processed, 1:64 in two samples, 1:128 in four samples, 1: 256 in seven samples and 1: 512 in two samples. It gave 100 percent protection to the challenge chicks. Their faeces were normal and no clinical sign was recorded even 40 days post vaccination.]]> Augustine, P.C. and H.D. Danforth,199034196202Shirley, M.W., A.C. Bushell, J.E. Bushell, V. McDonald and B. Roberts,1995137453457Davis, P.J., S.H. Parry and P. Porter,19791979Fitz-Coy, S.H. and S.A. Edgar,1992364448Fu, H.M. and Y.C. Lee,197625155Gordon, H.M. and H.V. Whitlock,1939125052Hayat, B., F. Jabeen, C.S. Hayat and M. Akhtar,199616164167Lebacq-Verheyden, A.M., J.P. Vaerman and J.F. Heremans,197222165175Long, P.L.,198425318McDonald, V., S. Ballingall and M.W. Shirley,1982Eimeria acervulina.]]>842130Rose, M.E.,197698481484Ryley, J.F., R. Meade, J. Hazelhurst and T.E. Robinson,197673311326Shaker, S.A.,19971997Soulsby, E.J.L.,19827th Edn.,Pages: 809Pages: 809Tokuda, G. and R.E. Warrington,1970203539Tyzzer, E.E., H. Theiler and E.E. Jones,1932Eimeria of the chickens.]]>15319393Otto, H.S., 19791979