Herd immunity occurs when enough people in a group are immune to a specific infection that it cannot spread easily from person to person. Vaccination programs have been successful in creating herd ...

To stop the spread of an infectious disease like measles, you don’t have to vaccinate everyone. But you do have to vaccinate many. Just how many? To let you discover for yourself, we simulated an ...

Editor’s note: Dr. Jerome Adams, who served as US surgeon general in the first Trump administration, is a distinguished professor in pharmacy practice and public health at Purdue University. The ...

DeLisa New Williams remembers when measles spread like wildfire through her elementary school. One day, a kid was out sick. Then suddenly everyone was infected, including her. “It knocked out the ...

If we measure the strength of public health by its ability to protect those who cannot yet protect themselves, the maternal–newborn dyad is where that test begins. The measles outbreak in rural North ...

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CEBU CITY, Philippines — The supply of anti-rabies vaccine here has fallen so critically low that city veterinarians can no ...

BROOMFIELD, Colo. — There are now seven measles cases linked to schools in Broomfield. Measles outbreaks like this in Colorado have not happened in decades. Until 2025, Colorado had not recorded more ...