There is a lack of long-term safety data and comprehensive studies on several childhood vaccines. For example, the Haemophilus influenzae B (Hib) vaccine’s safety was monitored for only 30 days post-vaccination, and the diphtheria, tetanus, pertussis (DTaP) vaccine’s adverse reactions were tracked for just four days.
In 2013, the National Academy of Medicine, tasked by the National Vaccine Program Office, found limited studies on the association between the full immunisation schedule and health outcomes, with no studies addressing long-term effects of cumulative vaccines.
