👉 Isoantigenicity is a property of two or more proteins, which are called antigens. In other words, it means that when these antigens are tested together, they give rise to a single immune response in the body, regardless of whether the antigen was present on its own or not. For example, if you have two different types of bacteria, and one of them is an antibiotic resistant to antibiotics, then the person who ingests this antibiotic will be able to survive because it has