Recorded on June 17, 2026
Vaccines remain one of the most effective tools in modern medicine, dramatically reducing the incidence, severity, and mortality of many once-common childhood infections. Yet, as public conversation around vaccines continues to evolve, medical professionals are increasingly called upon not only to understand the science, but also to help families navigate questions, concerns, and uncertainty.
During a recent CHKD Provider Relations Lunch & Learn, pediatric infectious diseases specialist Eric Engstrom, MD, discussed the history, safety monitoring, regulatory oversight, and clinical counseling considerations surrounding vaccines.
Understanding Vaccine Confidence
For many clinicians, vaccines fall into the category of things we know with confidence: they are safe, effective, and standard of care. For many patients and families, however, vaccines may feel less certain, particularly when they encounter competing messages online or in the media.
Dr. Engstrom emphasized the importance of recognizing this gap. Families’ concerns should not be dismissed. Instead, providers can help by listening carefully, validating reasonable questions, and offering clear, evidence-based context.
A Long History of Impact
Vaccination has a long history, dating back to Edward Jenner’s smallpox vaccine in the late 1700s. Since then, vaccine development has expanded significantly, particularly beginning in the mid-20th century as new technologies and public health initiatives made immunization more widespread.
The impact has been profound. Diseases such as measles, rubella, tetanus, and polio have seen dramatic reductions following vaccine implementation. Beyond preventing infection, vaccines have also reduced hospitalizations, deaths, long-term complications, and societal healthcare costs.
How Vaccine Safety Is Monitored
Vaccines undergo extensive review before being recommended for use. Development begins with basic research and preclinical studies, followed by phased clinical trials to evaluate safety, immune response, and effectiveness. After FDA review and approval, the Advisory Committee on Immunization Practices evaluates how the vaccine should be used, including age groups, dosing schedules, and target populations.
Safety monitoring continues after implementation through systems such as the Vaccine Adverse Event Reporting System and the Vaccine Safety Datalink. These systems help identify possible safety signals, which can then be studied in larger, more controlled populations.
Dr. Engstrom noted that some vaccine-associated adverse events are real but rare, including anaphylaxis, Guillain-Barré syndrome, intussusception with rotavirus vaccine in certain circumstances, and febrile seizures, particularly with MMRV compared with separate MMR and varicella vaccines. Other concerns, including associations with autism, SIDS, type 1 diabetes, asthma, spontaneous abortion, and multiple sclerosis, have not been supported by large-scale research.
Counseling Families About Common Vaccine Concerns
A key takeaway from the discussion was the importance of approaching vaccine conversations with confidence, patience, and respect.
When families express concern that children receive “too many shots,” clinicians can help clarify whether the concern is about the number of injections or the effect on the immune system. Children are exposed to countless antigens every day through eating, breathing, and interacting with their environment. Vaccines contain targeted antigens designed to stimulate protection without causing disease.
For families interested in alternate schedules, providers can explain that the recommended schedule is designed around safety, immune response, disease risk by age, and available evidence. Delaying or changing that schedule may leave children vulnerable during periods when they are most at risk.
Specific vaccine concerns also require thoughtful discussion. For example, the hepatitis B birth dose offers early protection in the rare event of missed, false-negative, or evolving maternal infection. HPV vaccination is best framed not as a response to current sexual activity, but as cancer prevention that provides protection before future exposure.
Risk in Context
Dr. Engstrom emphasized that vaccines, like all medical interventions, carry some risk. However, those risks are exceptionally low, especially when compared with the risks of vaccine-preventable disease or even many routine medical treatments.
The goal is not to claim that vaccines are entirely risk-free, but to help families understand risk in proportion. When viewed alongside the risks of natural infection, hospitalization, long-term complications, and death, vaccination remains overwhelmingly beneficial for individual patients and public health.
Supporting Informed, Evidence-Based Decisions
As vaccine recommendations and public conversations continue to shift, medical professionals play an essential role in helping families make informed decisions. Clear communication, empathy, and an understanding of the evidence can help build trust and support better outcomes for children.
Vaccines remain a cornerstone of pediatric preventive care — not because they are free of all risk, but because the benefits are well-established, the risks are carefully monitored, and the protection they provide is substantial.
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