This is also true with the regular flu vaccine. Very few people die from the flu. What they die from is a secondary infection, usually pneumonia. However, healthy people are not at risk.
Actually, the reason the vaccine is targeted to the young adult age group is that healthy people are more likely to die from this type of flu than those who have an aging immune systems. Usually those that die, die as a result of an overreaction of the immune system, called a cytokine storm.