A measles alert has been issued by the New Jersey Department of Health after three cases of the highly-contagious virus were confirmed in Bergen County.An unvaccinated resident was diagnosed with measles after returning from an international trip and spread it to two close contacts,

If you think you’ve been exposed to measles, do not show up at a clinic or hospital without calling first, Public Health — Seattle & King County said. To avoid possibly spreading measles, limit contact with others and wear a well-fitting mask if you need to go to a health care facility, the department said.

Three measles cases have been reported in Bergen County, New Jersey after an unvaccinated person who recently traveled internationally spread it to two other unvaccinated people, officials say. CBS News New York's Derick Waller reports.