#Miasmatheory

A resurgence of ancient medical ideas is reshaping public health discourse in unexpected ways, as evidenced by recent moves in the United States under Health Secretary Robert F. Kennedy Jr. Drawing on the centuries-old miasma theory—which proposes that diseases arise from “bad air” or pollution—Kennedy has implemented policies and made public statements that challenge the contemporary scientific consensus around vaccines. The revival of this long-discredited framework echoes far beyond American borders, offering important lessons for Thailand as it contends with its own vaccine hesitancy and public health challenges (NPR).

Public health debates are increasingly shaped by old ideas resurfacing in new forms. In the United States, Health Secretary Robert F. Kennedy Jr. has sparked discussions by revisiting miasma-era thinking that disease comes from polluted air and the environment. His statements and policies emphasize environmental factors and immune strengthening over vaccination, prompting concern among infectious disease experts and offering Thai readers a lens to understand vaccine hesitancy at home.

The miasma concept originated with ancient Greek physicians, including Hippocrates, and once guided sanitation efforts by linking disease to foul air. While it helped prompt cleaner cities, the theory was displaced by germ theory in the 19th century, a shift that underpins today’s vaccines and antibiotics. As data show, vaccines dramatically reduce disease and save lives, a point echoed by Thai health officials who maintain strong immunization programs amid ongoing public dialogue.