Avian incl chickens Flashcards
A flock from a local broiler poultry farm is presented. Half of the flock has died in the last 10 days. Examination of the flock shows chickens that are gasping and coughing, extending their necks to inhale. Some have blood-stained beaks. There are no obvious neurologic signs.
Necropsy finds hemorrhage in the airways, as shown below.
The most likely presumptive diagnosis is?
Infectious laryngotracheitis.
A highly contagious herpesvirus infection, ILT is characterized by RESPIRATORY signs (rales, severe dyspnea, coughing). In severe forms, mortality can reach 50%, typically due to occlusion of the trachea by blood, mucus or caseous exudates. In most states ILT is REPORTABLE.
What are the clinical signs of infectious coryza?
milder respiratory disease, with swelling around the eyes and head, sneezing, nasal discharge
What are the clinical signs of Newcastle disease?
characterized primarily by respiratory signs. Severe forms include depression, neurologic signs or diarrhea. Look for GI hemorrhage with most severe form, Viscerotropic Velogenic Newcastle disease (VVND), which is REPORTABLE.
What are the clinical signs of fowlpox?
only a few birds typically affected with scablike lesions around head.
What are the clinical signs of Marek’s disease?
See only depression before death with Marek’s disease . Some birds may have characteristic unilateral paresis (one leg forward, one leg back). On necropsy, see lymphoid tumors in organs and enlarged nerves.
What is the causative agent of fowl cholera?
Pasteurella multocida - gram -ve rod
clinical signs of acute fowl cholera
fever, mucoid discharge from the mouth, diarrhea, petechia, ecchymoses, increased pericardial and peritoneal fluid, and death. chronic - localised disease
diagnosis & treatment of fowl cholera
Diagnosis is based on identifying the organism from samples in conjunction with clinical signs. Vaccines are available for prevention of the disease. Sulfa antibiotics are used for treatment.
