14 health problems possible: The report found convincing evidence that vaccines could cause 14 health problems, including seizures, brain inflammation and fainting, allergic reactions and temporary joint pain. But that those complications appeared to be very uncommon and most often found in people with immune system deficiencies.

The vaccine with most problems: The highest number of problems was with the varicella vaccine, given to prevent chickenpox. In some patients -- most of whom had compromised immune systems -- the vaccine caused brain swelling, pneumonia, hepatitis, meningitis, shingles and chickenpox.

No link: It found no link between being immunized and autism or Type 1 diabetes.