Gaines County is a vast, flat expanse far in the west of Texas: more than 1,500 square miles of sparsely populated farmland.

Pediatricians and public health experts said they’ve seen a surge in requests for “bonus” doses of measles immunization ...

The measles outbreak is a “call to action for all of us,” health secretary and longtime anti-vaccine activist Robert F. Kennedy Jr. wrote in an opinion essay for Fox News on Monday. “Vaccines not only ...