Influenza viruses and transmission & Sudden symptoms and complications
Lesson 1 · 5 min
Based on MedlinePlus en español — Influenza. Original educational summary, read by a medical doctor and confirmed reliable, pending formal approval. Not medical advice.
Learning objectives
- Explain influenza viruses and transmission.
- Explain sudden symptoms and complications.
Influenza viruses and transmission
Influenza is a respiratory infection caused by influenza viruses. Infected people release droplets during coughing, sneezing, or talking. Less commonly, contaminated-object contact followed by touching the face can transmit infection. Illness ranges from mild to severe or fatal. Older adults, young children, pregnant people, and people with certain chronic conditions are at greater risk of complications, making prevention and prompt assessment especially important. Symptoms often begin suddenly: feverishness, chills, cough, sore throat, congestion, headache, muscle aches, and fatigue.
Sudden symptoms and complications
Symptoms often begin suddenly: feverishness, chills, cough, sore throat, congestion, headache, muscle aches, and fatigue. Vomiting or diarrhea can occur, especially in children. This abrupt pattern differs from the more gradual onset of a common cold. Complications can include pneumonia, ear or sinus infections, bronchitis, or inflammation affecting other organs. Influenza can worsen existing conditions, including provoking attacks in someone with asthma. Assessment begins with history and symptoms.
Key concepts
- Influenza viruses and transmission
- Influenza is a respiratory infection caused by influenza viruses.
- Sudden symptoms and complications
- Symptoms often begin suddenly: feverishness, chills, cough, sore throat, congestion, headache, muscle aches, and fatigue.
- History and respiratory swab testing
- Assessment begins with history and symptoms.
- Annual vaccination and early care
- Most people recover without medical attention and should stay home with mild illness except to obtain care.