21.   There is no proof the vaccine caused the deaths but procedures were not followed.

22.   Until that initial step is taken, there is no evidence that the vaccine causes problems.

23.   With too much attenuation, the vaccine will not cause the immune response needed for protection.

24.   Part of the investigation is to figure out how a vaccine could physically cause part of the intestine to slip out of place.

25.   Others worry about safety, fearing the vaccine could cause the disease.

26.   Additionally, one expert Tierney relied upon in his book said the author misquoted him as saying the vaccine could have caused an epidemic.

27.   Both vaccines can cause fever, and fever in turn can lead to seizures.

28.   But instead of causing immunity, the vaccine caused disease.

29.   Experts disagree as to whether there is a link to brain damage, but agree that if the vaccine causes such damage, it does so only rarely.

30.   Health officials are extremely wary of offering vaccinations to all Americans because the vaccine can cause severe side effects, especially in children and people with immune diseases.