Changes

*''B. bronchiseptica'' causes [[Nasal Cavity Inflammatory - Pathology#Bacterial rhinitis|Atrophic rhinitis of pigs]] in association with [[Pasteurella multocida|''Pasteurella multocida'']]

*''B. bronchiseptica'' causes [[Rhinitis#Bacterial rhinitis|Atrophic rhinitis of pigs]] in association with [[Pasteurella multocida|''Pasteurella multocida'']]

*Colonises nasopharynx

*Colonises nasopharynx

*Infection must occur during first few weeks of life

*Infection must occur during first few weeks of life

*Produces dermonecrotic toxin which damages osteoblasts, preventing bone formation

*Produces dermonecrotic toxin which damages osteoblasts, preventing bone formation

*Leads to turbinate atrophy without distortion of the snout in uncomplicated infections

*Leads to turbinate atrophy without distortion of the snout in uncomplicated infections

*[[Nasal Cavity Inflammatory - Pathology#Bacterial rhinitis|Atrophic rhinitis]] results when [[Pasteurella multocida|''Pasteurella multocida'']] colonises and produces osteolytic toxin, leading to bone resorption

*[[Rhinitis#Bacterial rhinitis|Atrophic rhinitis]] results when [[Pasteurella multocida|''Pasteurella multocida'']] colonises and produces osteolytic toxin, leading to bone resorption

*Malformation of snout in growing pigs as well as poor growth  

*Malformation of snout in growing pigs as well as poor growth  

*increases with high stocking density and poor ventilation

*increases with high stocking density and poor ventilation

*In rapidly growing young pigs (4-12 weeks old)

*In rapidly growing young pigs (4-12 weeks old)

*Clinical signs

*Clinical signs

**Progressive facial deformity with [[Nasal Cavity Inflammatory - Pathology#Infectious causes of rhinitis|rhinitis]], catarrhal nasal discharge  

**Progressive facial deformity with [[Rhinitis#Infectious causes of rhinitis|rhinitis]], catarrhal nasal discharge  

**Sneezing, coughing, can progress to dyspnoea and anorexia

**Sneezing, coughing, can progress to dyspnoea and anorexia