While cleaning out a freezer in a Pennsylvania vaccine research facility, a lab worker discovered several frozen vials labeled “smallpox,” launching an FBI and CDC investigation, according to recent news reports.

Only two labs in the world — a CDC lab in Atlanta, Georgia, and a Cold War-era bioweapons lab in Russia — can legally hold samples of the deadly virus, Live Science previously reported. In the recent incident, a total of 15 vials — five labeled “smallpox” and 10 labeled “vaccinia” (the virus used in smallpox vaccines) — were discovered in the Merck facility, according to an “official use only” alert sent out to the Department of Homeland Security leadership on Tuesday (Nov. 16), and obtained by Yahoo News

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