Influenza 1

Influenza (flu, flu) virus is highly contagious respiratory disease, and spread from person to person by sneezing and coughing. Comparing the most influenza viral respiratory infections other Kalzkam (cold), we find that the symptoms of influenza infection are 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, Valonflonza caused the death of 20,000 people, and many more that are Tnoimanm in hospitals, estimated that 20-25 million people visit their doctors annually in the United States because of influenza.

Global epidemiology of influenza occurs unexpectedly, usually every 10-40 years, and is infected 50% of the population, leaving millions dead in the world. Occurred in the previous outbreaks and epidemics worldwide in the years 1889-1890 and 1899-1990 and 1918 and 1957-58 and 1968-69. Global epidemiology occurred in 1918 caused the death of 20-40 M people in the world. After this disaster the world has been active research was the discovery of the virus in 1933.

Occurs epidemiology of influenza virus because of its rapid change. When a simple change in the virus remains a large part of retaining people immune to it. But the occurrence of a radical change of the virus, which could lead to the emergence of a new strain does not have immunity in humans begins with the global threat of proliferation. It will be monitoring the activities of influenza virus globally by the World Health Organization through the 110 control center of the flu in 80 countries. Together, the centers represent a global system to monitor influenza, which guarantees the compilation of information about the virus and its spread and test samples to determine its properties. And this information is used to determine the components of the annual influenza vaccine by the World Health Organization, which recommends giving it to certain groups of people exposed to greater risk of infection when the virus such as the elderly (greater than 65 years old) and those with diseases such as asthma vest.

There are now fears of a pandemic, a new world possible to happen at any time, and the reason for this is what happened in the month of May / May 1997 in Hong Kong, after the death of a child hit by pneumonia (pneumonia) due to influenza virus, and injured 17 people at the end of the year the same 6 people have died, the same virus that was originating in the chicken (the so-called time chicken or bird flu).

Influenza virus
Influenza viruses are divided into 3 types called the flu (a), (b) and (c), or influenza A, B, and C. Types (a) and (b) cause quite a seasonal infection prevalence in winter. In addition to humans, affects the type (a) pigs, horses, and many birds. Type (b) usually infects only humans. The type (c) different 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 of ecstasy to him at all, and does not cause the spread of the epidemic.

Influenza viruses have the ability to continuous change. This constant change can avoid the virus from the human immune system and therefore we are exposed to influenza infection throughout life. This is done in the following way: When influenza virus infection the immune system to produce antibodies specific for this virus; change the properties of the virus antibodies can not recognize the old to the new virus and thus are new infections. Of course, antibodies old still have the ability to provide partial immunity against the virus, according to the quality of change that is the virus.

How the virus spread?
The virus is transmitted from person to person by sneezing and coughing. The virus is inhaled through the nose or mouth and goes to the cells of the respiratory system that starts with the reproduction. The virus can also enter the human body through the mucous membranes of the nose, mouth or eyes as well.

Infected person can transmit infection to others before symptoms appear about 24-48 hours and the ability to continue spreading the virus to the third or fourth day after onset of symptoms. Regardless of the nature of some 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 influenza infection
Symptoms usually begin abruptly (usually remembers a time when the person has symptoms) are not restricted to the respiratory system. Comparing the most influenza viral respiratory infections other Kalzkam (cold), we find that the symptoms of influenza infection are very severe.

Traditional symptoms of influenza include:

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Headache, chills, dry cough
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Fever (38-41 degrees), especially in children. The temperature rises rapidly during the first 24 hours and may last for a week
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Muscle pain. May include all the muscles in the body, but concentrated in the legs and lower back
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Severe pain in the joints
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Pain or burning sensation in the eyes when you look at the light
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When you begin to reverse the symptoms are respiratory symptoms such as sore throat and a cough that lasts for two weeks
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Symptoms usually disappear after the acute illness of 5 days and most patients recover within a week or two weeks
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When a few people continue to symptoms such as extreme tiredness and laziness or inaction for several weeks, causing difficulty in returning to normal life and work. The reason for this is unknown
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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. And possibly acquire a fever because of cramps (very high temperature)

The following table illustrates the difference between influenza and common cold (cold)
Property of colds influenza
Condition generally localized in the nose and throat
Speed of onset of symptoms suddenly gradually
Always high fever is usually mild
Symptoms of headache, sneezing
Shaking chills and pain in the throat
Muscle pain
Sense of dry nose and throat
Cough
Pain in the ear
Moderate stress intensity
Malaise to extend the duration of the disease one to two weeks recovering fast
Severe complications such as pneumonia, moderate