Disease X Added To WHO's Global Epidemic Threat List

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.

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.

Other threats on the list include the Ebola virus, severe acute respiratory syndrome (SARS,) Zika virus and Rift Valley fever, Newsweek reported.

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