Respiratory viral infections

Respiratory viral infections are illnesses caused by viruses that affect the respiratory system, including the nose, throat, airways, and lungs. Common examples include the cold, flu, and COVID-19. These viruses spread mainly through droplets when an infected person coughs, sneezes, or talks, and can also spread by touching contaminated surfaces. Symptoms typically include coughing, sore throat, nasal congestion, fever, and fatigue. Most infections are self-limiting, but some can cause serious illness, especially in vulnerable populations. Prevention includes good hygiene, vaccination, and avoiding close contact with infected individuals.