Protection against influenza,1918. US soldiers wearing gauze masks to protect against influenza (flu). The masks were totally ineffectual. During and after the First World War,there was a global influenza pandemic,known as the Spanish Flu (1918-1919). A fifth of the world's population was infected,and between 20 and 50 million people died. Such pandemics occur when a new infectious virus appears for which the human population has no immunity. This can happen when there is a major change in the surface proteins of an existing virus. Photographed in Seattle,USA | |
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Credit: | Science Photo Library |
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