Systematic Veterinary Virology

DIFFERENTIAL DIAGNOSIS

• Highly pathogenic avian influenza should be differentiated from
• VVND,
• Infectious laryngotracheitis and
• Acute bacterial diseases such as fowl cholera and Escherichia coli.
• However, in an area where AI is prevalent, such as during an outbreak, sound presumptive diagnosis can be made by flock history, signs, and gross lesions.