Influenza

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Influenza    Influenza  Influenza ( flu , flu ) virus is highly contagious respiratory disease , and is spread from one person to another by sneezing and coughing spray . Comparing the most influenza viral respiratory infections other Alaskan ( cold ) , we find that the symptoms of the flu be very severe . Seasonal influenza infection , the spread of infection is usually in the winter and last several weeks. And infects an estimated 100 million people in America , Europe , and Japan ( approximately 10 % of the population) . In addition to preventing millions of people from practicing their work or go to school , Valentina caused the death of 20,000 people , and a greater number of Neiman that are in hospitals , and it is estimated that 20-25 million people visit their doctors every year in the United States because of the flu. Global epidemiology of influenza occur unexpectedly , usually every 10-40 years , and is infected 50 % of the population , leaving millions dead worldwide . Occurred in the previous waves of a global pandemic in the years 1889-1890 and 1899-1990 and 1918 and 1957-58 and 1968-69 . Global epidemic that occurred in 1918 caused the death of 20-40 million people worldwide . After this disaster, the world has been active research was the discovery of the virus in 1933 . Happens epidemiology of influenza virus because of its ability to rapidly change . When a change is simple virus remains a big part of people Andean him immunity . But the occurrence of a fundamental change of the virus , which can lead to the emergence of a new strain does not have immunity in humans begins with the global proliferation threat . So are monitored activity of influenza virus globally by the World Health Organization by 110 control center of the flu in 80 countries . These centers collectively represent a global system to monitor influenza which ensures collect information about the virus and its spread and examine the samples to determine its characteristics . And this information is used to determine the components of the annual influenza vaccine by the World Health Organization , which advises giving to certain groups of people exposed to a greater risk of HIV infection , such as when the elderly (greater than 65 years ) and those with thoracic diseases such as asthma . Currently, there are fears of a pandemic of a new world possible to happen at any time , and the reason for that is what happened in the month of May / May 1997 in Hong Kong , after the death of a child injured pneumonia ( pneumonia ) due to the flu virus , and injured 17 people at the end of the year 6 of them died the same people and the same virus that was originating chicken ( then the so-called bird flu or chicken ) . Influenza virus Influenza viruses are divided into three types of flu called (a) , (b ), (c ) or influenza A, B, and C. types ( a) and ( b) cause quite a seasonal prevalence of the infection in the winter. In addition to humans , affects the type (a) pigs , horses , and many birds . Type ( b) usually infects only human . The type (c ) differs from the other two types of the most important of several aspects of the nature of the infection of the respiratory system , it is either cause minor symptoms or no symptoms at all BOJ him , and does not cause a pandemic . Influenza viruses have the ability to constantly changing . This constant change can avoid the virus from the human immune system and therefore we are exposed to infection with influenza lifelong . This is done in the following way : When the influenza virus infection is the immune system to produce antibodies to the virus present quality ; change the characteristics of the virus antibodies can not recognize the old new virus and therefore are new infections . Of course antibodies old still has the ability to provide partial immunity against the virus , according to the quality of the change that is on the virus.   How the virus spread ?  The virus is transmitted from person to person by coughing and sneezing spray . The virus is inhaled through the nose or mouth and up to the cells of the respiratory tract , which begins in reproduction . The virus can also enter the human body through the mucous membranes of the nose , mouth or eyes , too. Infected person can pass the infection to others before symptoms appear about 24-48 hours and the ability to continue to spread the virus to the third or fourth day after the onset of symptoms . Regardless of the nature of some of the symptoms of the flu , which affects all parts of the body , did not detect the presence of the virus outside the respiratory tract . Symptoms of the flu Symptoms usually begin suddenly (usually remembers a time when a person has symptoms began ) and are not confined to the respiratory tract. Comparing the most influenza viral respiratory infections other Alaskan ( cold ) , we find that the symptoms of the flu be very severe . Flu symptoms include traditional : Headache , chills, a dry cough Fever ( 38-41 degrees ) , especially in children. Temperature rises rapidly during the first 24 hours and may last for a week Muscle aches . Maybe include all muscles of the body , but is concentrated in the legs and lower back Severe pain in the joints Pain or burning sensation in the eyes when you consider the light When the public begins recrudescence respiratory symptoms such as sore throat and a cough that lasts for weeks Usually acute symptoms of the disease disappear after 5 days and most patients recover within a week or two weeks When the lack of people continue to symptoms such as extreme tiredness and laziness or inaction for several weeks , causing difficulty to return to normal life and work. The reason for this is unknown In children less than 5 years of symptoms is usually concentrated in the stomach as well as for the respiratory system with the presence of vomiting , diarrhea , and abdominal pain . Perhaps because of cramps acquire a fever ( high rise in temperature)