Pasteurella multocida is an important veterinary and opportunistic human pa
thogen. The species is diverse and complex with respect to antigenic variat
ion, host predeliction and pathogenesis. Certain serological types are the
aetiologic agents of severe pasteurellosis, such as fowl cholera in domesti
c and wild birds, bovine haemorrhagic septicaemia and porcine atrophic rhin
itis. The recent application of molecular methods such as the polymerase ch
ain reaction, restriction endonuclease analysis, ribotyping, pulsed-held ge
l electrophoresis, gene cloning, characterisation and recombinant protein e
xpression, mutagenesis, plasmid and bacteriophage analysis and genomic mapp
ing, have greatly increased our understanding of P. multocida and has provi
ded researchers with a number of molecular tools to study pathogenesis and
epidemiology at a molecular level. (C) 2000 Elsevier Science B.V. All right
s reserved.