Mealey's (December 8, 2022, 12:38 PM EST) -- PHILADELPHIA — The Pennsylvania federal judge overseeing the Zostavax shingles vaccine multidistrict litigation granted a motion by defendant Merck & Co. Inc. to dismiss 1,189 cases because the plaintiffs failed to provide prima facie evidence that their shingles were caused by the Oka strain of the varicella-zoster virus (VZV) used to make the vaccine rather than the “wild-type” of the virus from childhood chickenpox infections....