Influenza

In occasional cases, even for healthy young adults, flu can cause either respiratory distress syndrome or pneumonia, which are manifest with a difficulty in breathing.
 * Influenza**, commonly known as the **flu**, is an infectious disease caused by RNA viruses of the family Orthomyxoviridae (the influenza viruses), that affects birds and mammals.The most common symptoms of the disease are chills, fever, sore throat, muscle pains, severe headache, coughing, weakness/fatigue and general discomfort.Although we use to confuse it with other illnesses, especially the common cold, influenza is a more severe disease than the common cold and is caused by a different type of virus. Influenza may produce nausea and vomiting, particularly in children,but these symptoms are more common in the unrelated gastroenteritis, which is sometimes called inaccurately "stomach flu."



Typically, influenza is transmitted through the air by coughs or sneezes, creating aerosols containing the virus. Influenza can also be transmitted by direct contact with bird droppings or nasal secretions or through contact with contaminated surfaces. Influenza spreads around the world in seasonal epidemics, resulting in the deaths of a lot of people every year,up to millions in some pandemic years.

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