BROODING PERIOD (0-2 WEEKS)

CASE HISTORY, FLOCK #2

      Flock #2 is from a family farm with a single, light-tight, caged pullet house, housing 60,000 chicks.  All chicks originated from an NPIP approved leghorn breeder flock and were vaccinated at one day of age for Marek's disease at the hatchery. Mortality was normal during the first week. (10, 15, 17 chicks daily).  Newcastle/Bronchitis vaccine was given by spray at 9 days of age.  Two days later the mortality increased. (700, 100, 500 chicks per day).  Morbidity is 8-10%.  No clinical signs were reported by the service person.  


CLINICAL SIGNS, FLOCK #2

      Twenty (20) chicks were presented for examination. (5 alive, 10 dead)  All were noticeably affected, extremely weak and depressed.  Some birds had fecal material adhered to their vents and in several chicks signs of respiratory disease were noticed.

Important Information:

 

DIFFERENTIAL
DIAGNOSES (DD)

EXPECTED POST MORTEM
FEATURES FOR EACH 
BEST CONFIRMED BY
WHAT FURTHER WORK-UP

 

POSTMORTEM EXAM, FLOCK #2

18/20 "foamy" airsacs
18/20 dehydrated  
18/20 "small" chicks
10/20 infected yolk sacs
8/20 pasty vents

 

Updated differential diagnosis (based on clinical history and postmortem findings) list the most likely first.

 

What further laboratory tests would you run to confirm your diagnosis?

 

Treatment (for each differential listed)

 

Prevention (for each differential listed)