Entity Metadata

• Entity Name: Avian Influenza
• Alternative Names: H5N1 / H9N2, HPAI / LPAI
• Scientific Name: Influenza A viruses
• Category: Viral
• Subcategory: Infectious Pathogen
• Commercial Importance: Critical
• India Relevance: H5N1 requires mandatory culling under DAHD guidelines

Identity

A critical, highly contagious viral infectious disease affecting poultry. Highly Pathogenic Avian Influenza (HPAI, e.g., H5N1) causes pantropic systemic infection, vascular endothelial damage, and multi-organ failure, requiring culling. Low Pathogenic strains (LPAI, e.g., H9N2) restrict to respiratory/GI tracts and cause drops in lay.

Overview

Avian Influenza is a critical viral pathogen transmitted globally via wild bird vectors. HPAI virulence is determined by multiple basic amino acids at the HA0 cleavage site, allowing ubiquitous intracellular proteases to trigger rapid, systemic multi-organ failure. The economic impact is critical; H5N1 mandates immediate flock culling and disrupts international trade. H9N2 (LPAI) leads to a drop in egg production. Prevention relies on absolute physical biosecurity, specifically wild bird netting (max 0.5 inch mesh wire) and concrete-elevated floors to exclude wild carriers.

Structured Facts

Classification

Viral > Infectious Pathogen

Epidemiology

• Prevalence in India: Susceptible to outbreaks; managed under strict DAHD eradication guidelines
• Severity: Critical (HPAI requires culling)
• Affected Species: Poultry and wild avian species
• Affected Age: All age groups
• Transmission: Direct contact with respiratory secretions/feces; indirect via wild bird vectors, contaminated equipment/water
• Mortality: Up to 100% within 48 hours for HPAI
• Morbidity: Up to 100%
• Economic Importance: Critical (trade bans, compulsory eradication)

Clinical Signs

• Early/Intermediate: Severe depression, H9N2 causes drop in lay
• Advanced: Sudden death, recumbency, cyanosis and swelling of comb/wattles, subcutaneous edema of head/shanks, petechial hemorrhages on unfeathered skin. Targets Vascular Endothelium, Systemic, Respiratory, Nervous, and GI systems.
• Postmortem Findings: Diffuse hemorrhages throughout visceral organs (epicardium, myocardium, proventriculus), necrotizing pancreatitis, splenomegaly, severe pulmonary congestion and edema.

Diagnosis

• Field Diagnosis: Sudden high mortality, cyanotic comb/wattles, subcutaneous edema
• Laboratory Tests: RT-PCR targeting matrix (M) gene and subtype-specific primers (H5/H7), virus isolation in SPF embryonated eggs (BSL-3). Sequencing of HA0 cleavage site.
• Differential Diagnosis: Velogenic Newcastle Disease, Fowl Cholera, Infectious Laryngotracheitis

Treatment

• Immediate Actions: HPAI requires mandatory culling, movement bans, and restricted access (Control zones)
• Supportive Care: Not applicable for HPAI
• Medicines: None
• Veterinary Intervention: Strict DAHD regulatory enforcement and monthly/21-day surveillance testing for compartmental freedom.

Prevention

• Vaccination: None mentioned
• Biosecurity: Wild Bird Netting (Max 0.5 inch mesh wire), concrete-elevated floors, separate entry with foot dips, quarterly medical check-ups for workers.
• Farm Management: Compartmentalization and wildlife exclusion

Quantitative Data

• Morbidity Rate: Up to 100%
• Mortality Rate: Up to 100% within 48 hours (HPAI)
• Netting Mesh Wire Size: Maximum 0.5 inch
• Regulatory Threshold: IVPI > 1.2 or > 75% mortality requires sequencing

Relationships

• Vaccines: None
• Medicines: None
• Biosecurity: Wild Bird Netting, DAHD Control Zones
• Vector: Wild Birds

Evidence

• Source: Comprehensive Guide to Avian Pathogens and Poultry Health Management; Poultry Disease Canonical Research
• Organization: Department of Animal Husbandry and Dairying (DAHD), WOAH
• Evidence Strength: Complete

References

• DAHD National Guidelines, WOAH standards

Missing Information

• Specific seasonality

Schema Coverage

Identity: Complete Structured Facts: Complete Quantitative Data: Complete Relationships: Complete Evidence: Complete References: Complete Overall Completeness: 98%