Flashcards in Avian influenza and new castle disease Deck (33)
what are the signs of avian influenza?
repiratory signs, depression, reduced food and water intake, reduced egg production
What are the two pathotypes of avian influenza?
low path AI and high path AI
What species can avian influenza occur in?
all birds species
What is avian influenza caused by?
a type A influenza virus
What are the two important surface antigens of influenza viruses?
How are low path and high path AI differentiated?
By inoculating susceptible chickens. HPAI causes death in 6/8 or more while LPAI do not result in death
All HPAI outbreaks so far have been what??
H5 or H7
How can avian influenza by removed from the environment?
detergents, disinfectant and heat
What animals are the natural reservoir for avian influenza?
wild waterfowl--can be asymptomatic, shed for long time
What are two man-made reservoirs for avian influenza?
1. live bird markets
2. commercial swine facilities
What is the problem with live bird markets?
Focal part for gathering many species
not cleaned or depopulated--continuous supply
Is there egg transmission with AI?
What are the clinical signs of LPAI outbreaks?
1. respiratory disease (coughing, seezing, rales, lacrimation, sinusitis)
variable mortality, morbidity
What ar the signs of HPAI outbreaks?
2. sudden, short disease. signs may involve resp, enteric or nervous system: diarrhea, edema of the head and face, or nervous disorders
What are the lesions of LPAI?
mild to moderate inflam of trachea, siuses, air sacs, conjunctiva
What are the lesions of HPAI infection?
fibrinous eudates on air sacs, oviduct, pericardial sac, or peritoneum. may have foci of necrosis. SIGNS OF VASCULAR DAMAGE--cyanosis and edem of head, ulceration of comb, edema of feet, petechiation etc
How is avian influenza diagnosed?
Clinical signs, lesions, history
confirmation with serology and virus detection
How is LPAI prevented?
prevent exposure to influenza virus via contact with waterfowl, shorebirds, live bird markets, swine farms
How is avian influenza controlled?
2. serologic monitoring
3. vaccination once the subtype IDed in an outbrea
Is avian influenza zoonotic?
Infection of humans rare but can happen
What is newcastle disease?
a viral disease of many kinds of birds. It has lentogenic, mesogenic and velogenic strains that cause different clinical signs
What are the signs associated with lentogenic strains of newcastle disease?
little or no signs
What are the signs associated with mesogenic strains?
1. resp signs, CNS signs, high mortality
2. sudden drop in egg production, low mortality in layers
What are the signs associated with velogenic strains?
Marked respiratory signs--dyspnea, diarrhea, paralysis, death
What is the OIE definition of new castle disease?
an inection of poultry caused by an avian strain of paramyxovius 1 with an intracerebral pathogenicity index in day old chicks greater than 0.7
What is the occurance of new castle disease?
in chickens, sometimes turkeys. ALL age groups susceptible
Is new castle disease zoonotic?
humans in contact with disease for first time can develop localized eye infection conjunctivitis
How can new casatle disease be spread?
Infected birds birds including wild birds. Excretions (aerosols and feces) and can contaminate tools, clothing ec
What are the lesions with lentogenic and mesogenic new castle disease?
minimal. may have mild airsacculitis, conjunctivits, tracheitis.