Thank you for the update. Did your vet get a culture for testing, so that you will know for sure? Pasteurella is also known as fowl cholera. Here is some information to read on the disease:
http://www.thepoultrysite.com/diseaseinfo/61/fowl-cholera-pasteurellosis
http://www.merckmanuals.com/vet/poultry/fowl_cholera/overview_of_fowl_cholera.html
http://www.hobbyfarms.com/livestock-and-pets/fowl-cholera-in-chickens.aspx
http://www.thepoultrysite.com/diseaseinfo/61/fowl-cholera-pasteurellosis
http://www.merckmanuals.com/vet/poultry/fowl_cholera/overview_of_fowl_cholera.html
http://www.hobbyfarms.com/livestock-and-pets/fowl-cholera-in-chickens.aspx