vaccine-induced immune enhancement

Vaccine-induced immune enhancement occurs when a vaccine unintentionally causes the immune system to react more strongly to a future infection, potentially worsening the illness. Instead of protecting, the immune response may lead to increased inflammation or tissue damage. This phenomenon is rare and is carefully studied during vaccine development to ensure safety. It highlights the importance of designing vaccines that effectively stimulate protective immunity without triggering harmful reactions upon exposure to the actual virus or pathogen.