Introduction: Influenza-like illness (ILI) is defined by the CDC as fever (temperature 100°F or 37.8°C) and either cough or sore throat in the absence of another known cause. Methodology: The patients with clinical features of Influenza like illness were enrolled. A complete clinical examination was carried out and relevant investigations done and documented in the proforma. Results: Fever was the most common symptom and was seen in all cases (100%), followed by cough (94.3), sore throat (74.3%), nasal catarrh (22.9%), difficulty in breathing (8.6%), vomiting (11.4%), diarrhea( 2.8%). Conclusion: The clinical manifestations of influenza A H1N1 virus infection range from self- limited uncomplicated subfebrile respiratory illness to severe and even fatal respiratory disease and extrapulmonary disease. Gastrointestinal symptoms include vomiting, diarrhea and abdominal pain.

Keywords: Influenza; Laboratory Profile; Clinical Manfestations.