Even though it doesn't yet exist, a malady called "Disease X" has been added to the World Health Organization's list of threats that could cause a deadly worldwide epidemic.
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The WHO's website says Disease X represents a "known unknown" that could be created by biological mutation in the future, Newsweek reported.
The hypothetical Disease X could become real in a number of ways, such as through biological warfare or the sudden spread of virus similar to the Spanish flu that killed at least 40 million people in 1918-19.
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