Changes

*2 forms of the disease

*2 forms of the disease

**''''Progressive' atrophic rhinitis'''

**''''Progressive' atrophic rhinitis'''

***Due to infection of the nasal turbinates by P.multocida strains carrying the toxA gene that encodes for an osteolytic toxin. [[Pasteurella multocida|''P.multocida'']] adheres poorly to mucous membranes, and therefore requires a predisposing nasal insult to assist colonisation eg: co-infection with [[Bordetella bronchiseptica|''B.bronchiseptica'']] or [[Cytomegalovirus|Porcine cytomegalovirus (inclusion body rhinitis)]]

***Due to infection of the nasal turbinates by P.multocida strains carrying the toxA gene that encodes for an osteolytic toxin. [[Pasteurella multocida|''P.multocida'']] adheres poorly to mucous membranes, and therefore requires a predisposing nasal insult to assist colonisation eg: co-infection with [[Bordetella bronchiseptica|''B.bronchiseptica'']] or [[Porcine Cytomegalovirus|Porcine cytomegalovirus (inclusion body rhinitis)]]

***Turbinate bone atrophy is permanent and progressive

***Turbinate bone atrophy is permanent and progressive

**''''Non-progressive' atrophic rhinitis'''

**''''Non-progressive' atrophic rhinitis'''