Nearly a year since the Zika virus outbreak arrived in Miami, scientists say they've learned new details about how the mosquito-born virus emerged and spread throughout the Americas. Researchers ...

A second child, who was unvaccinated and had no underlying health conditions, died from measles in Texas on April 3.

A second child has died from measles amid an ongoing outbreak that is sweeping across ... The "most effective way" to prevent the spread of the virus is to get the vaccine for measles, mumps ...