The vaccine wears off in a few days. The vaccine tells the body to make copies of the “spike protein”. After a few days, the body breaks down the vaccine. In the meantime, the body makes copies of the spike protein. The immune system sees the spike protein and starts making antibodies to fight it off.
Those antibodies do not last forever. It is my understanding that the lifespan of antibodies is largely determined by the type of virus they are for. For example, luckily the antibodies for measles and polio last decades. On the other hand, antibodies for rhinovirus and coronavirus last months not years, which is part of the reason why you can have more than one cold in your life.
Those antibodies do not last forever. It is my understanding that the lifespan of antibodies is largely determined by the type of virus they are for. For example, luckily the antibodies for measles and polio last decades. On the other hand, antibodies for rhinovirus and coronavirus last months not years, which is part of the reason why you can have more than one cold in your life.