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It has long been thought that travel by patients infected with serious viruses poses a threat to people in the areas they visit, but a new study by scientists at Oxford University has confirmed the opposite.
The transmission of fatal patients and viruses represents a natural long-term adaptation to humans and creates true immunity against deadly epidemics, the study said.
Although many people may be infected with diseases from remote areas, such as the native population in waves of mass immigration to the United States in the sixteenth and seventeenth centuries, researchers believe that the proliferation of deadly bacteria and viruses in the world strengthens the immune system of millions of people.
"We will not have enough time for viruses and bacteria to become irreversible because the immune system has already learned to fight it," says Professor Robin Thompson, lead author of the study. "Unlike the Spanish flu that left more than 50 million people killed in 1918 and swine flu in 2009.
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