The major manifestations of influenza may consist only of fever, headache, muscle aches, and pains in the legs.

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Influenza often presents with abrupt fever and prominent systemic symptoms like headache and myalgias, with leg pains being a common part of the muscle aches. These systemic complaints can be the dominant features, even without a productive cough or other respiratory signs. That pattern fits influenza best. Dengue typically includes marked joint and muscle pains but also other features like rash and retro-orbital pain; malaria shows fever with paroxysms and sweating; pneumonia usually brings cough with sputum and breathing difficulties. So the combination of fever, headache, and muscle and leg pains as the main manifestations is most characteristic of influenza.