Flucelvax is a flu vaccine made from dog kidney cells. Flucelvax is now approved for people aged 18 and older. Flucelvax Vaccine Package Insert “FLUCELVAX (Influenza Virus Vaccine), a vaccine for intramuscular injection, is a “subunit” influenza virus vaccine prepared from virus propagated in Madin Darby Canine Kidney (MDCK) cells, a continuous cell line. These cells