Influenza spreads around the world in a yearly outbreak, resulting in about three to five million cases of severe illness and about 250,000 to 500,000 deaths. The infection may be confirmed by testing the throat, sputum, or nose for the virus. A person may be infectious to others both before and during the time they are sick. It can also be spread by touching surfaces contaminated by the virus and then touching the mouth or eyes. Usually, the virus is spread through the air from coughs or sneezes.This is believed to occur mostly over relatively short distances. Complications of influenza may include viral pneumonia, secondary bacterial pneumonia, sinus infections, and worsening of previous health problems such as asthma or heart failure. Nausea and vomiting occur more commonly in the unrelated infection gastroenteritis, which is sometimes inaccurately referred to as “stomach flu” or “24-hour flu”. In children there may be nausea and vomiting but these are not common in adults.
The cough, however, may last for more than two weeks. These symptoms typically begin two days after exposure to the virus and most last less than a week. The most common symptoms include: a high fever, runny nose, sore throat, muscle pains, headache, coughing, and feeling tired. Influenza, commonly known as “the flu”, is an infectious disease caused by the influenza virus.
29 Settembre 2015 direttore Health Library
0 kommentar(er)
