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Bird flu, or avian influenza, is a viral infection that primarily affects birds but can also infect humans. The most dangerous strains to humans are H5N1 and H7N9.

The virus spreads through direct contact with infected birds or their secretions. It can also spread via contaminated surfaces. Migratory birds play a major role in its transmission.

Symptoms in humans include fever, cough, sore throat, muscle aches, and in severe cases, respiratory distress and neurological complications. Early detection is crucial for treatment.

Those at higher risk, such as poultry workers, should take preventive measures like proper hygiene and protective gear. Vaccination programs and public health awareness are key in preventing outbreaks.