Entity Metadata

• Entity Name: Aspergillosis
• Alternative Names: Brooder Pneumonia
• Scientific Name: Aspergillus fumigatus / Aspergillus flavus
• Category: Fungal
• Subcategory: Infectious Pathogen
• Commercial Importance: Medium to High
• India Relevance: Lung nodules in chicks

Identity

An infectious, non-contagious fungal disease affecting poultry chicks. Inhaled hydrophobic conidia germinate deep within the lungs, releasing gliotoxins that induce severe granulomatous pneumonia and respiratory failure.

Overview

Aspergillosis, or Brooder Pneumonia, is a severe fungal pathogen primarily affecting young chicks in hatchery and brooder systems. Small airborne conidia bypass upper respiratory filters, germinating into tissue-invading hyphae within the lungs and air sacs. They form characteristic yellow-white granulomas. There is no horizontal bird-to-bird transmission and no effective treatment in commercial poultry. Prevention is paramount, demanding strict disinfection of incubators and hatcheries, adequate ventilation, and absolute avoidance of damp or moldy litter. The lung damage from Aspergillosis is a direct predisposing trigger for Ascites (right-sided heart failure) in fast-growing broilers.

Structured Facts

Classification

Fungal > Infectious Pathogen

Epidemiology

• Severity: Medium to High (high mortality in chicks)
• Affected Species: Poultry
• Affected Age: Young chicks < 3 weeks of age; adults can develop chronic form
• Transmission: Inhalation of airborne conidia (no direct bird-to-bird transmission)
• Mortality: 5% to 50%
• Morbidity: 1% to 10%
• Economic Importance: Medium

Clinical Signs

• Early/Intermediate: Rapid, deep gasping (dyspnea) without tracheal rales, severe depression, lethargy, anorexia
• Advanced: Nervous signs (torticollis, loss of equilibrium), ocular lesions (unilateral blindness); targets Respiratory system, CNS, and Eyes.
• Postmortem Findings: Multiple discrete, yellow-white, firm cheesy granulomas (1-5mm) in lungs. Thickened, cloudy air sacs lined with dense bluish-green velvety mold.

Diagnosis

• Field Diagnosis: Gasping chicks without rales, lung nodules
• Laboratory Tests: 10% KOH wet mounts of lung lesions (showing branching septate hyphae), Isolation on Sabouraud dextrose agar (smoky blue-green colonies)
• Differential Diagnosis: Newcastle Disease, Infectious Bronchitis, Colibacillosis

Treatment

• Immediate Actions: Remove moldy litter, improve ventilation
• Medicines: No effective treatment in commercial poultry

Prevention

• Vaccination: None exist
• Biosecurity: Mitigated by standard Biosecurity Protocols, hatchery/incubator disinfection
• Farm Management: Avoid damp/moldy litter, maintain optimal ventilation

Quantitative Data

• Morbidity Rate: 1% to 10%
• Mortality Rate: 5% to 50%
• Target Age: < 3 weeks

Relationships

• Vaccines: None
• Medicines: None
• Biosecurity: Hatchery Sanitation, Litter moisture control
• Predisposing Relationships: Triggers Ascites Syndrome (Pulmonary Hypertension)

Evidence

• Source: Poultry Disease Canonical Research; Comprehensive Guide to Avian Pathogens
• Evidence Strength: Complete

References

Missing Information

• Prevalence in India and specific seasonality

Schema Coverage

Identity: Complete Structured Facts: Complete Quantitative Data: Complete Relationships: Complete References: Partial Evidence: Complete Overall Completeness: 95%