Mycoplasma Gallisepticum (MG)
Contagious disease of poultry, gamebirds, pigeons, and passerine birds of all ages. Younger birds are more susceptible than older or mature birds.
At one time the most common means of MG spreading was by trans ovarian passage from infected breeders. Today, however, breach of sound management and biosecurity measures is more often the cause.
MG can spread within the poultry house by direct bird to bird contact and by exhaled respiratory droplets (indirect contact).
Clinical signs may be slight when uncomplicated. Sticky exudate from nostrils, foamy exudate in eyes, and swollen sinuses. Airsacculities with yellow exudate in air sacs. Infected birds develop respiratory rattles, sneeze and flip their heads.
Many infections display similar symptoms especially cold type symptoms. It is a mistake to presume that every bird with rattly breathing or other cold like symptoms has MG. Without a proper lab test one sometimes cannot be really certain what the infection is.
May spread slowly through a flock or maybe acute. Affected birds often are stunted and unthrifty. Infection can be acute in an individual bird, but take considerable time to spread throughout a flock. Recovered birds remain carriers.
Treatment is erythromycin, tylosin, spectinomycin and lincomycin. Tylosin consistently gives good results. Administration of most of these antibiotic is by feed, water or injection.