*Responsible for secondary infections following primary viral and mycoplasmal infections, especially in the lungs, for example during [[Bacterial infections#Enzootic pneumonia of calves|Enzootic pneumonia of calves]] and pigs | *Responsible for secondary infections following primary viral and mycoplasmal infections, especially in the lungs, for example during [[Bacterial infections#Enzootic pneumonia of calves|Enzootic pneumonia of calves]] and pigs |