Fowl Cholera: Immunization of Chickens with Potassium Thiocyanate (KSCN) Extract of Pasteurella multocida Serotype 3

Abstract
Potassium thiocyanate (KSCN) extract of P. multocida, serotype 3, was immunogenic against a challenge infection of homologous and 1 heterologous strain tested (serotype 1). Ouchterlony''s gel-diffusion analysis revealed the presence of 2 components in the KSCN-extracts of serotypes 3 and 1, which were antigenically identical.