J00-J06: Acute upper respiratory infections

Acute upper respiratory infections refer to a group of infections targeting the upper part of the respiratory tract, which includes the sinuses, nasal passages, pharynx, and larynx. These conditions often set in quickly, presenting with symptoms such as a runny or stuffy nose, sore throat, cough, and general feeling of malaise or discomfort. The causes are usually viral, but can also be bacterial or caused by other microorganisms. Furthermore, they can be transmitted through droplets when an infected person coughs or sneezes, or by direct contact with infected surfaces. The infection often resolves on its own within a week or so, but in some cases, may persist or progress to a more severe condition, such as bronchitis or pneumonia. While any person can contract an acute upper respiratory infection, children, the elderly, and those with weakened immune systems are particularly susceptible.