Experimental Studies of Some Strains of Pasteurella Multocida from Different Animal In Sheep

1- Pr ev Louaty identified st.rains of Pasteure1l.a multocida types A,B,D and E were used fol’ studying the pathogenicity and imillunogenicity of eaoh separate strain in sheep. 2- Stl’ains used co npr Laed s t aridar d st.rainsa;nd other local strains iso:3- Pasteurella mlultooida type Astrlains wer’e more virulentto sheep and led to highrel mortalities than. the other strains, w hile Pasteure11a multocida .type B stl’ ainse au sed no deaths.Meanwhile Pasteu.r-ell§ illul tooid,a types D and E strain,s led to d.eaths to some inj eoted sheep.4-- A polyvalent fo.rlllalised vaccine Was prepared f.rom Pasteurella multocida types A, D and E strains. Titres ;in vacoinated sheep were determined by ’applying the indirect haem.agglutination test afte.r 2, 3 and 4 weeks after- vaccination. . The .resust.rains to sheep. 5- The -.results obtained ensure the need for studying sheeppasteurellosis, in respect to isol,tion Qf the causative agents, role of other field and pet animals in spreading the disease as well as methods ofprotection of sheep aganist this disease in Egypt.