Flu symptoms 2013 What is flu and How do you catch him - 0 views
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Anatoliy Simeonov on 10 Aug 13The flu is an acute infectious disease of viral etiology. Flu symptoms are fever, cough, headache and muscle aches. It spreads easily from person to person, it circulates around the world and can affect everyone - from the youngest to the elderly and cause epidemics and pandemics. Disease known since ancient times. There is evidence that humanity has experienced so far over 30 flu pandemics, and only in the last century, there were three. The most serious of these, so called. "Spanish flu", founded in 1918, has led to the deaths of 20-50 million people. The flu virus belongs to the family Orthomyxoviridae, that there is only one race - Influenzavirus, including viruses causing disease in humans, mammals and birds. Some flu strains are species specific (infect only certain species, or only the people), but there are strains of flu that can spread from animal species to humans. Famous 3 types of flu virus - type A, type B and C. Influenza type C viruses, although similar in morphology differs from the other two types of the antigen and other basic properties. Influenza C occurs sporadically and causes respiratory disease with a slight leakage. Viruses that cause seasonal epidemics are of type A and type B. The most volatile are type A flu virus