POULTRY MEDICINE – DISEASES Aspergillosis (Brooder Pneumonia)

Aspergillosis (Brooder Pneumonia)
Aspergillosis -a mycotic disease, usually IN respiratory system – many birds

Aspergillosis (Brooder Pneumonia) OCCURRENCE
OCCURRENCE
•All species susceptible
•Chicks + pullets less than 6 weeks – MAINLY
•World wide – inc Australia
•Extremely common

Aspergillosis (Brooder Pneumonia) AETIOLOGY
AETIOLOGY
•Aspergillus fumigatus = key pathogen,
•others also – eg Aspergillus flavus causing current outbreak in Australia

Aspergillosis (Brooder Pneumonia) EPIDEMIOLOGY
EPIDEMIOLOGY
•Normal to find in litter + feed i.e. normal part of the environment .: isolating doesn’t prove Dz
•Ideal growth conditions – will grow profusely
•Most birds resist infection but can be overwhelmed by massive exposure/challenge

Aspergillosis (Brooder Pneumonia) TRANSMISSION
TRANSMISSION
1.Inhalation of spores
2.Conjunctiva
3.Contaminated hatcheries
4.Contaminated chick delivery boxes

Aspergillosis (Brooder Pneumonia) CLINICAL SIGNS
CLINICAL SIGNS – VIP TO KNOW WHEN 1ST SIGN OCCURS
•if from Hatchery CSx at 2-3 days (very early)
•If Environment – 5-6 days

•Gasping + laboured breathing
•No gurgling noises – may be a whistle i.e. DRY sound/whistle
•Poor growth
•Depression
•Diarrhoea?
•Conjunctivitis
•Metastasis

To brain – CNS lesions

Aspergillosis (Brooder Pneumonia) PM
POST MORTEM
•(white) Nodules + plaques in lungs, air sacs, trachea
•Mycelial growth with sporulation in air sacs
•Metastatic Foci in brain, eye, etc.
•Cheesy material in conjunctival sac
•See Hyphae with microscopic examination

Aspergillosis (Brooder Pneumonia) DIAGNOSIS
DIAGNOSIS
1.Signs + lesions
2.Confirm Dx – Demonstration of hyphae
•Fresh preparations – look under microscope
•Histological sections
3Culture – not usually – takes time AND
ASP is common contaminate

Aspergillosis (Brooder Pneumonia) TREATMENT
TREATMENT
•Reduce contamination – improve ventilation, remove infected birds that are coughing up the spores
•Anti-mycotic agents

Aspergillosis (Brooder Pneumonia) CONTROL
CONTROL
1.Reduce mould growth
•Husbandry (environment), eg avoid softwood shavings
•Agents to prevent growth – eg copper sulphate
2.Hatchery hygiene
3.Feed additives to stop it growing in the feed

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