Moderate Problems (Uncommon)
Seizure (jerking or staring) (about 1 child out of 14,000)
Non-stop crying, for 3 hours or more (up to about 1 child out of 1,000)
High fever, over 105°F (about 1 child out of 16,000)
Severe Problems (Very Rare)
Serious allergic reaction (less than 1 out of a million doses)
Several other severe problems have been reported after DTaP vaccine. These include:
Long-term seizures, coma, or lowered consciousness
Permanent brain damage.