The Antibody Response of pregnant ewes to rift valeey fever virus vaccine & the resuting maternal immunity

This work contained a detailed_stu~, on the level duration of maternal antibodies passively transferreato lambs born fro~es repeatedly vaccinated with the local RVF killed T.C. vaccine.The RVF specific antibodies in ewes sera, colostrum 1I well aa lambs sera were measured by OFT, AGPT, SNI, HIas well a8 IFA techniques. The following resu1ts were obtained :The different. used aerological testa showed that ewe.boostered with a vaccinal dose about 2 months before delivery responded by ~.!’iae in the antibody t1’tres in their sera.Such eleva te<i ti trea were retained till partllr1 tion. Only OFT, HI and SNI were applioable to colostrol sample’hile AGPT, IFA gave unsatisfactory results.Colostral antibody levels as measured by OFT, HI and SNI tests were higher or at least as high aa antibody titres d aera of corresponding ewes collected at