Influenza pandemic

Influenza ward at Walter Reed Hospital, in Washington, D.C. during the Spanish flu pandemic of 1918–1919.

Structure of the influenza viron. The hemagglutinin (HA) and neuraminidase (NA) proteins are shown on the surface of the particle. The viral RNAs that make up the genome are shown as red coils inside the particle and bound to Ribonuclear Proteins (RNPs).

The various types of influenza viruses in humans. Solid squares show the appearance of a new strain, causing recurring influenza pandemics. Broken lines indicate uncertain strain identifications.[17]

An influenza pandemic is an epidemic of an influenza virus that spreads on a worldwide scale and infects a large proportion of the human population. In contrast to the regular seasonal epidemics of influenza, these pandemics occur irregularly, with the 1918 Spanish flu the most serious pandemic in recorded history. Pandemics can cause high levels of mortality, with the 1918 Spanish influenza pandemic estimated as being responsible for the deaths of approximately 50-100 million people. There have been about three influenza pandemics in each century for the last 300 years, the most recent one being the 2009 flu pandemic.

单词	Asian influenza
释义	Asian influenza 英语百科 Influenza pandemic An influenza pandemic is an epidemic of an influenza virus that spreads on a worldwide scale and infects a large proportion of the human population. In contrast to the regular seasonal epidemics of influenza, these pandemics occur irregularly, with the 1918 Spanish flu the most serious pandemic in recorded history. Pandemics can cause high levels of mortality, with the 1918 Spanish influenza pandemic estimated as being responsible for the deaths of approximately 50-100 million people. There have been about three influenza pandemics in each century for the last 300 years, the most recent one being the 2009 flu pandemic.
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Asian influenza

Influenza pandemic