For most of my life, preventable infectious diseases existed at the margins of medicine. Influenza was seasonal but manageable. Hepatitis outbreaks were contained. Childhood hospitalizations from rotavirus or meningococcal disease were rare enough to be notable. COVID-19 may have shattered predictability, but even then, many of us believed the lessons we learned would be followed by renewed investment in prevention.

Instead, we now stand at a crossroads.

A crossroads in prevention

Recent guideline changes by the Centers for Disease Control and Prevention (CDC) have profoundly reshaped the childhood vaccination landscape. Several vaccines once universally recommended, including influenza, hepatitis A, hepatitis B, COVID-19, and meningococcal vaccines, have been moved into categories requiring shared decision-making or limited to high-risk groups.

Even though these vaccines remain available upon request and are covered by insurance, public health is heavily influenced by people’s shared sense of responsibility. When universal recommendations disappear, so does the assumption that prevention is routine. And when prevention becomes optional, disease becomes inevitable.

Training for the return of disease

As a medical student, I am being trained to recognize this shift in real time. My education increasingly includes not just how to prevent disease, but how to manage its return. How do I diagnose hepatitis B in children? How do I isolate meningococcal infection? How do I explain to families why a once-rare illness is now something we need to actively screen for again? This new reality feels like a huge step backward, and it is deeply unsettling.

Medicine is built on preparation. We train for worst-case scenarios. We rehearse rare complications. But there is a difference between preparedness and normalization. Preparing for a world where preventable infectious diseases are once again common feels like resignation disguised as progress.

What makes this moment in time particularly dangerous is not just the policy change itself, but the broader context in which it occurs. Childhood vaccination rates have already been declining for years, fueled by misinformation, politicization, and erosion of trust in institutions. Universal recommendations served as a stabilizing force in that unsteady environment and sent a clear, evidence-based signal that protection mattered. Weakening that signal risks accelerating trends we already know lead to outbreaks.

For example, measles resurged not because the vaccine disappeared, but because vaccination rates fell below protective thresholds. Influenza hospitalizations rise when vaccination rates drop. These outcomes are documented, predictable, but most importantly, preventable.

The normalization of harm

What troubles me most is not scientific uncertainty. Medicine evolves, evidence changes, and recommendations adapt. I do not fear that process. What I fear is the normalization of harm. I fear a generation of clinicians trained to expect illnesses that should have remained footnotes in history. I fear that what once shocked us will simply become routine.

And the resulting consequences will not be evenly distributed. The burden of “choice” in health care rarely falls equally. Families with consistent access to primary care, medical literacy, and trusted clinicians may navigate shared decision-making successfully. However, those facing structural barriers, fragmented care, or limited access are far more likely to fall through the cracks. When prevention becomes individualized, existing inequity widens.

Rebuilding trust

I entered medicine believing that progress meant fewer ICU beds filled with patients suffering from preventable disease, not more. I believed that advances in public health were cumulative, and that once we learned how to prevent harm at scale, we would choose to honor, rather than unlearn, those lessons. Yet today, even talking about vaccination feels like walking a tightrope.

Rebuilding that public trust demands transparency, humility, and sustained engagement. It will require institutions willing to acknowledge past failures while still defending evidence-based prevention. Students and future health care providers will play a critical role in that effort as community advocates, leaders, and translators between the science of medicine and the people it serves.

Moving forward should not mean relearning old lessons the hard way. It should mean remembering why prevention mattered in the first place.

Umayr R. Shaikh is a medical student.