A boy in Haifa has measles, the Health Ministry announced on Sunday.
The case is linked to two cases reported about a week and a half ago, in a pair of brothers.
None of the children were vaccinated prior to exposure.
There have been dozens of cases of measles, a highly contagious disease that causes fever, malaise, and rash, and can have severe and even life-threatening complications, found among unvaccinated Israelis in recent months.
The Ministry called on Israelis to vaccinate their children against the virus.