Measles cases in West Texas are still rising two months after the outbreak began.

The U.S. has improved its surveillance system for tracking new coronavirus variants such as omicron, boosting its capacity by tens of thousands of samples since early this year.

The United States opened its borders to people fully vaccinated against COVID-19, but some who got the shots are finding they're still not eligible to visit.

Coronavirus infections among the New York Yankees team and staff underscore that the infections are possible even after vaccination.