I found the following .pdf link from the CDC's website.
Bulletin of the World Health Organization 2000;78:186-194.
Type in page 4 and hit enter. You will see page 5 of 9 at the top.
Quotes:
"No vaccine is perfectly safe or effective." (left side of page under the title Discussion)
"Current knowledge of vaccine safety is incomplete..." (left side of page under the title Discussion)
Now look higher on the left side of this page under Table 5. Studies in progress or planned, Vaccine Safety Datalink, 1999
"Hepatitis B vaccination and risk of multiple sclerosis..."
"Timing of hepatitis B vaccination and risk of type 1 (juvenile) diabetes."
"Mortality risk following vaccination, including hepatitis B."
"Wheezing and astham associated with vaccinations."
"Risk of inflammatory bowel disease associated with measles-mumps-rubella vaccine."
etc.
"Possible health effects of thimerosol."
The bottom line is this. Vaccines can cause problems and are not perfectly safe. Because the safety of vaccines is continually being studied, everyone should weigh the benefits of taking vaccines versus not taking them. For me, the annual flu vaccine is not worth the risk.