The health departments from all Bay Area counties urged people to get vaccinated against measles because of rising cases across the country.

Health officials said the risk of exposure to measles remains low in the Bay Area. The safest way to fight it is to take a measles, mumps and rubella (MMR) vaccination shot if you’re under 3 years old and to get two of them if you’re older than 3.

Amid a growing number of measles cases across the United States, health officials from all nine Bay Area counties and neighboring jurisdictions on Friday urged residents to get vaccinated against the highly contagious virus.