PRIMARY ROUTES OF POULTRY DISEASE TRANSMISSION

HORIZONTAL

Hatchery Transmission
(special type
of airborne)
Large numbers of susceptible young chicks in environment of high humidity, high air flow and 99F temperature. e.g. Aspergillosis, Salmonella, AK.
Airborne Transmission:  Among pen mates House-to-house Farm-to-farm. e.g. Newcastle, Bronchitis
Food-Borne Transmission: On-farm contamination of feed. e.g. Candidiasis
Contaminated prior to farm delivery. e.g. Salmonella
Vector-Borne Transmission: 
Man - Equipment
Free-flying birds  - Predators & rodents
Insects - Artificial Insemination
Litter & houses
Environment: Contaminated uncleaned poultry house and litter, e.g. Marek's Disease.
RECOVERED CARRIER BIRDS e.g. MG, LT, Hemophilus

                 

VERTICAL

True Vertical Ovarian or uterine infection, e.g. Pullorum, AE, MG.
Apparent Vertical Fecal contamination of egg with subsequent penetration, e.g. most Paratyphoid salmonellae

 

Back to Syllabus Home Page