[2 new  avian diseases in Chad: infectious laryngotracheitis and Gumboro's disease].
D000818:Animals; D002596:Chad; D007827:Laryngitis / Q000662:veterinary*; D011201:Poultry Diseases / Q000453:epidemiology* / Q000517:prevention & control; D014136:Tracheitis / Q000662:veterinary*; D014611:Vaccination
Deux maladies aviaires nouvelles au tchad: la laryngotrachéite infectieuse et la maladie de Gumboro.