I had a pertussis immunization. I felt nothing different afterward. However the injection site developed a blister over the entry hole, stayed for a long time, and never completely healed. I had the dermatologist treat it with nitrogen gas. It healed as much as it could, and though it looks fairly normal now, it still is a little flaky. The doctor told me I am allergic to pertussis vaccine. Good thing it didn't make me sick.