Adenovirus infections commonly manifest with cold or flu-like symptoms. These include fever, sore throat, severe cough, runny nose, difficulty breathing, and eye irritation. The infection can also lead to more serious conditions such as:

* Conjunctivitis (Pink Eye): Eye inflammation.
* Acute Bronchitis: Inflammation of the airways in the lungs.
* Pneumonia: Lung infection.
* Acute Gastroenteritis: Inflammation of the stomach or intestines, characterized by diarrhea, vomiting, and abdominal tenderness/bloating.

These symptoms can be more severe, especially in children and individuals with weakened immune systems. Early diagnosis and effective hygiene measures are critical to prevent complications. Medical attention is strongly advised if symptoms worsen or persist.