. >> reporter: the parents of 18-year-old hanna bruesewitz asked the supreme court to let them sue ae company's vaccine left their daughter with life-long injuries. >> for the rest of her life, hanna bruesewitz is going to need care for -- in order to live her life. >> reporter: when hanna was six months old she was given a vaccine no longer sold. her parents say since then she's suffered seizures and developmental problems. >> the disorder and disability she suffers from is incredibly difficult, it's expensive and there's no treatment for it. >> reporter: this case has the justices looking closely at what are called vaccine courts, lawmakers created that special legal system 24 years ago. it's the only way for people to bring lawsuits against vaccine manufacturers. congress set it up as a way to care for people injured by vaccines and to protect drug companies from most vaccine-related lawsuits. drug companies say they couldn't function without that protection. >> if manufacturers are to be driven out of business today, we'll see a resurgence of infectious diseases we've almost forg