The Centers for Disease Control and Prevention (CDC) on Thursday determined that vials found at a Pennsylvania facility this week with labels reading “smallpox” did not contain the virus that causes ...

A Merck vaccine research lab in the Philadelphia area was temporarily placed on lockdown Tuesday night after the discovery of "questionable" vials inside a freezer that were labeled "smallpox" and ...

The "questionable vials" were discovered at a Merck facility by a lab worker clearing out a freezer earlier this week. The FBI and US Centers for Disease Control and Prevention (CDC) have investigated ...

Lee la historia en español aquí. UPDATE: The CDC announced Thursday that the vials did not contain the virus known to cause smallpox but instead contained the virus used in the smallpox vaccine. More ...

Hidden samples of the deadly virus raise serious security questions. July 8, 2014— -- Vials of the virus that causes smallpox were found in a National Institutes of Health research building that ...

A U.S. government scientist cleaning out an old storage room at a research centre near Washington made a startling discovery last week — decades-old vials of smallpox packed away and forgotten in a ...

Vials labeled with "smallpox" were found at a Merck facility in Montgomery County, Pennsylvania, where vaccine research is conducted, but it is unclear why the vials were there, according to the ...