antigenic
- a of or relating to antigens
- As it takes six months to produce a vaccine, virologists must be on the lookout for "antigenic drift" changes in the virus that would let it escape the immune responses .
- Past attempts to implant fetal islet cells failed because a small percentage of these cells have antigenic markers that trigger an immune response.
- The last major change was in 1969, and up until now there has not been another major antigenic shift.