evidence: - Some studies have detected a small increased risk of febrile seizures in young children following the flu shot in some flu seasons. In these studies, the risk of febrile seizures was increased for children 12 through 23 months of age, particularly when the flu shot was given at the same time as pneumococcal conjugate vaccine (PCV133) and diphtheria, tetanus, and pertussis (DTaP)-containing vaccine4. [...] CDC monitoring for the safety of vaccines [...] - Vaccine Safety Datalink (VSD): a collaboration between CDC and eight integrated health care organizations that conducts ongoing vaccine safety monitoring and in-depth analysis of vaccine safety data.