Acute nasopharyngitis

Acute nasopharyngitis, also say common cold, or influenza, commonly known as "cold", are the most common species of acute upper respiratory tract infection , mostly self-limiting, but the incidence of high-impact wide crowd, a large amount of economic loss rather macrophages, and can cause a variety of complications.

Epidemiology:

Acute nasopharyngitis mostly sporadic, but coronavirus infection can cause some pop, in the densely populated schools or barracks can be positive outbreak. Increase in prevalence with age the number has decreased, the annual prevalence of pre-school children 4 to 8 times, children 2 to 6 times, and adults from 2 to 5 times. According to statistics at the United States a year have 20% of colds in patients with incapacity, restricted activity every year there is 170 million days, an average of 0.8 days, 10% of the patients for medical treatment, medical costs per person expenditure of about 10 U.S. dollars a year loss of national medical expenses 250 million U.S. dollars, loss of working time every year 30 million working day, 30 million days absent from school for students. Is generally believed that the incidence of influenza in the winter are often the main influenza virus or respiratory syncytial virus infections, and nasal virus infection is not common in the cold season, the reasons not yet clear.