Last month, a measles outbreak in Texas raised concerns that declining vaccination rates might make the country susceptible to a disease once thought to be eliminated from the country. 146 people in West Texas,

Measles is not often seen in the United States, but Americans are growing more concerned about the preventable virus as cases continue to rise in rural West Texas.

Pediatricians and public health experts said they’ve seen a surge in requests for “bonus” doses of measles immunization following the death of an unvaccinated six-year-old in West Texas last week.

A second measles-related death was reported out of New Mexico this week. Here's where measles cases have been reported in the U.S. this year.

Multiple measles cases emerge in California, sparking public health concerns. Learn why vaccination is a key tool to stop the spread.

Most of the measles cases reported so far this year are in Texas, where health officials are trying to clamp down on a growing outbreak that has sickened more than 150 people. Other states have also recorded measles cases though they trail far behind Texas, including New Mexico, California and New York City.

Measles is one of the most contagious diseases. In California, there are three confirmed cases so far. Action News reached out to California Department of Public Health, who sent the following statement:

Symptoms typically start within 7-14 days of exposure, but also have been known to appear as long as 21 days later. Here's what Californians should know.

Measles cases are popping up across the United States, including an outbreak in Texas that has led to the death of a child.