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However, the nasal spray vaccine is expected to be effective in the 2019-2020 season. Influenza is commonly called the flu, but it's not the same as stomach "flu" viruses that cause diarrhea and vomiting.Flu viruses travel through the air in droplets when someone with the infection coughs, sneezes or talks. Influenza viruses are divided on the basis of antigenic structure into three types. Influenza Definition Usually referred to as the flu or grippe, influenza is a highly infectious respiratory disease. At least 30 pandemics of influenza have occurred since 1580. What is a pandemic? It can cause mild to severe illness. The virus is transmitted from person to person by direct contact and by airborne droplets of respiratory secretion expelled through coughing and sneezing. Get FLU full form and full name in details. Antigenic drift results from the gradual accumulation of new epitopes on viral H and N molecules, whereas antigenic shifts are caused by mutations in the genes that encode these molecules. But children and adults at high risk may develop complications such as: The CDC's definition of a flu epidemic relates to the percentage of deaths in a given week caused by influenza and pneumonia. Immunity arising from either natural infection or vaccination confers protection only against certain strains of virus. While influenza viruses circulate year-round, most of the time flu activity peaks between December and February, but activity can last as late as May. Influenza cannot be diagnosed with certainty or differentiated from other acute febrile syndromes on clinical evidence alone. Although you may feel miserable while you have it, the flu usually goes away in a week or two with no lasting effects. Diagnosis can only be confirmed by detection of viral antigen in nasal secretions by direct immunofluorescence or by a rising titer of antibody to influenzal hemagglutinin. The influenza A pandemic of 1918-1920 ("Spanish flu") caused more than 20 million deaths worldwide, 500,000 of them in the U.S. Less devastating pandemics occurred in 1957 ("Asian flu") and 1968 ("Hong Kong flu"). But sometimes, influenza and its complications can be deadly. The nasal spray still isn't recommended for some groups, such as pregnant women, children between 2 and 4 years old with asthma or wheezing, and people who have compromised immune systems.If you're young and healthy, seasonal influenza usually isn't serious. If future influenza viruses are similar to those you've encountered before, either by having the disease or by getting vaccinated, those antibodies may prevent infection or lessen its severity.The influenza vaccine isn't 100 percent effective, so it's also important to take measures such as these to reduce the spread of infection:Check out these best-sellers and special offers on books and newsletters from Mayo Clinic.But antibodies against flu viruses you've encountered in the past can't protect you from new influenza strains that can be very different immunologically from what you had before.Each year's seasonal flu vaccine contains protection from the three or four influenza viruses that are expected to be the most common during that year's flu season.
Flu is very infectious and easily spread to other people. "Mayo," "Mayo Clinic," "MayoClinic.org," "Mayo Clinic Healthy Living," and the triple-shield Mayo Clinic logo are trademarks of Mayo Foundation for Medical Education and Research.The Centers for Disease Control and Prevention (CDC) recommends annual flu vaccination for everyone age 6 months or older.For most people, influenza resolves on its own. Influenza C infection is typically mild or subclinical. An international network for influenza surveillance was established by the World Health Organization in 1948. In the United States, flu season occurs in the fall and winter. The annual mortality of influenza in the U.S. is believed to exceed 50,000, more than 90% of these deaths occurring in people 65 years of age or older.

Swine flu is caused by a particular strain of influenza A virus which is called H1N1v. It is one of the best place for finding expanded names.

You can inhale the droplets directly, or you can pick up the germs from an object — such as a telephone or computer keyboard — and then transfer them to your eyes, nose or mouth. But colds usually develop slowly, whereas the flu tends to come on suddenly.
Influenza (flu) is a contagious respiratory illness caused by influenza viruses. Taking antiviral drugs may reduce the length of your illness and help prevent more-serious problems.Influenza is a viral infection that attacks your respiratory system — your nose, throat and lungs. A pandemic is the worldwide spread of a new disease.