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The influenza virus began with birds. It is not known how it moved into humans. Influenza is extremely contagious. It can cause epidemics on a local level and worldwide. There are three strains of the virus: Type A causes worldwide… More »
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Learn influenza symptoms, causes, home remedies, treatment with antiviral drugs and prevention. Read about flu types (swine or H1N1, bird, stomach), when to get flu shots, how long it lasts and how it's spread. ... The flu (influenza) viruses; Influenza viruses cause the flu and are divided into three types, designated A,
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www.medicinenet.com/influenza/article.htm
www.medicinenet.com/influenza/article.htm
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However, influenza vaccine produced in the United States has never been capable of causing influenza. One type of influenza vaccine made with live attenuated influenza viruses has been developed, but this vaccine is made with viruses that can confer immunity but do not cause classic influenza symptoms.
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www.medicinenet.com/influenza/page2.htm
www.medicinenet.com/influenza/page2.htm
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The flu is caused by three types (strains) of viruses - influenza A, B and C. Type A is responsible for the deadly influenza pandemics (worldwide epidemics) that strike every 10 to 40 years, whereas type B causes smaller, more localized out...
http://respiratory-lung.health-cares.net/influenza-caus...
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The influenza virus causes the classic flu. Health professionals classify the virus as influenza type A and type B, each of which includes several subtypes or strains. ... The flu is caused by the influenza virus. Doctors classify the virus as influenza type A and type B, each of which includes several subtypes or strains.
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www.webmd.com/cold-and-flu/tc/influenza-cause
www.webmd.com/cold-and-flu/tc/influenza-cause
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Cause of Influenza Flu is caused by a virus in the body. It spreads when infected persons cough, sneeze, or even talk around others. People with flu are contagious a day before symptoms appear and three to seven days after. Children can be ...
http://wiki.answers.com/Q/What_causes_influenza
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"Nearly 100 American children under five years of age die every year from influenza(1) -- the goal of this program is to give parents the tools to help protect their families," said Richard Kanowitz, president of Families Fighting Flu.
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www.medicalnewstoday.com/articles/83631.php
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The flu is caused by three types (strains) of viruses — influenza A, B and C. Type A can be responsible for the deadly influenza pandemics (worldwide epidemics) that strike every 10 to ... And either types A or B can cause the flu that circulates almost every winter. Type C has never been connected with a large epidemic.
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www.mayoclinic.com/health/influenza/DS00081/DSECTION=ca...
www.mayoclinic.com/health/influenza/DS00081/DSECTION=causes
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