LAS VEGAS — A fourth death has been linked to measles in Pennsylvania and a UNLV doctor is sounding the alarm.

All four deaths have been reported in the last month as Pennsylvania’s measles outbreak continues to grow. They are the first deaths associated with measles in the state in 35 years.

In all of last year, the U.S. recorded three measles deaths.

PREVIOUSLY: Pennsylvania reports fourth measles-related death as outbreak nears 700 cases

The Health Department said in a news release Tuesday that the two people who died most recently were both unvaccinated.

Dr. Marc Kahn, professor and chief of hematology at UNLV’s Department of Internal Medicine at the Kirk Kerkorian School of Medicine, joined ARC Las Vegas and Evan Schreiber to explain how you can protect yourself and your family in the most safe and effective way possible with the MMR vaccine.