Pasteurella spp. are facultatively anaerobic, Gram-negative coccobacilli in the family Pasteurellaceae. There are several species of bacteria, with P. multocida being most clinically relevant to domestic and wildlife species. P. multocida is divided into three different subspecies: P. multocida gallicida, P. multocida multocida, and P. multocida septica. P. multocida subspecies may also be divided into five capsular serogroups (A-E) and sixteen somatic serotypes (1-16). B2 and E2 cause haemorrhagic septicaemia in addition to the possible pneumonia, enteritis, or septicaemia caused by the remainder of the capsular serogroups and somatic serotypes. For the purpose of voluntary reporting on non OIE-listed disease in wildlife, “Pasteurella spp.” refers to infections in non-domestic species. Information on infections of haemorrhagic septicaemia in livestock must be submitted through the mandatory reports for the OIE-listed diseases.