Pictures of the flu vrus

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The worst influenza pandemic in history was the Spanish flu of Even today, the seasonal flu outbreaks remain deadly. Between , and , people worldwide die from seasonal influenza-related respiratory illnesses each year, according to the U. Centers for Disease Control and Prevention.

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Photos: Innovative Ways People Tried to Protect Themselves From the Flu

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This is an influenza virus particle, also known as a virion, according to the Centers for Disease Control and Prevention. Virions are made up of an outer protein shell and an inner core of nucleic acid: in this case, eight single-stranded RNA segments. This illustration from the CDC is a 3-D graphical representation of an influenza virion's structure. Influenza viruses are members of the Orthomyxoviridae family , according to Encyclopedia Britannica, meaning their virions measure between 80 and nanometers in diameter. Each virion contains hemagglutinin and neuraminidase antigens , substances that cause our bodies to produce antibodies.

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Flu under the microscope

Subscriber Account active since. Free subscriber-exclusive audiobook! The flu shot is the best defense that we have to protect ourselves and others from getting sick with the influenza virus.

Next to the common cold, influenza or "the flu" is perhaps the most familiar respiratory infection in the world. In the United States alone, approximately 25 to 50 million people contract influenza each year. The symptoms of the flu are similar to those of the common cold, but tend to be more severe.