Global Health Meets Modern Travel

As we move from commencement season to summer, millions of Americans are expected to travel internationally. Lurking behind the sunglasses, flip-flops, and suitcases are several concerning infectious diseases, some related to the exact international travel expected in the next few months.

It is estimated that more than five billion passengers fly internationally each year. By comparison, fewer than 310 million people flew annually in the early 1970s. You can be in another country in half a day. Our adoption of convenient air travel and intercontinental mobility has transformed all aspects of society, including commerce, culture, and tourism. It has also fundamentally changed how quickly infectious diseases can spread. Before the 1950s, outbreaks could be regionally contained, now infectious diseases can spread like wildfire, moving across continents before symptoms even appear.

We Adopted, Now We Must Adapt

Several examples are still fresh in the news cycle. In early April, public health officials confirmed several hantavirus cases, all linked to a South American cruise voyage, and renewed Ebola concerns in Central Africa have raised alarms. Add this to a resurgence in measles and the continued spread of dengue fever and avian influenza across multiple regions of the world. While these outbreaks may, individually, seem geographically distant. Collectively, they reflect how quickly health risks can move through an increasingly connected world.

This reality is not a sign that globalization has failed. It is a call to action that requires a more modern understanding of public health preparedness from all of us.

Most travel-related health risks, including the common but nasty norovirus, remain manageable with basic preparation and preventive habits, including something as simple — and extensively supported by decades of public health research — as washing your hands regularly in high-contact spaces like airports, airplanes, and cruise ships. One of our most successful public health interventions is vaccines. Travelers should ensure their full vaccination panels are up to date before departure, pay attention to travel health advisories, carry necessary medications, mask when feeling ill or in poorly ventilated venues, and understand what healthcare access may look like at their destination. These are no longer niche considerations reserved for public health professionals — they are becoming part of responsible travel literacy. It is on the international (and domestic) traveler to know what public health precautions should be taken before departing for that well-earned vacation.

Public Health Is A Shared Responsibility

While we must do our part to keep ourselves and our fellow travelers’ health, and we must also support local, national, and global agencies to provide timely information and preparedness strategies to complement individual preparedness behaviors.

In these post-pandemic times, there has been a push to reinforce a stronger global health system, we are still faced with inconsistencies, gaps, and a lack of resources. Take the U.S., for example. In 2025 alone, the U.S. Department of Health and Human Services announced plans to reduce its workforce by nearly 25%, including an estimated 2,400 positions at the Centers for Disease Control and Prevention.

These agencies often operate quietly in the background, and most people only notice them when something goes wrong. But disease surveillance programs, vaccination infrastructure, and laboratory networks are precisely what allow health officials to identify outbreaks early, contain spread, and communicate accurate risk information before situations escalate.

Preparedness is not about expecting catastrophe. It is about building resilience in a world where local and global health are inseparable. International travel will continue to grow. Global commerce will continue to accelerate. Climate-related disruptions, urbanization, and population movement will continue reshaping how diseases emerge and spread.

The lesson I leave you with is not that you should live in fear of the next outbreak. It is that informed, measured public health awareness is now part of everyday life. In a connected world, public health security is no longer confined by national borders — and neither is our shared responsibility to protect it.