Laryngotracheitis causes bloody mucus from the mouth and nose--infectious bronchitis does not. IB and mild forms of mycopasma CRD or MG) can look alike. Having a necropsy done by your state vet or vet school is a good way to find out what the cause is. Many of the respiratory diseases as well as coccidiosis can come in twos or threes at a time. A chick that gets coccidiosis will have little immunity to fight off diseases.
