Frozen vials with “smallpox” labels found at a Pennsylvania lab contain the virus used in the vaccine for the virus and not the virus that causes the disease, public health officials said Thursday.

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 ...

"There is no indication that anyone has been exposed." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Update: Lab testing by the Centers for ...