Israel’s Health Ministry reported 481 new measles cases on Monday, bringing the total to 1,251 since early April. Officials estimate up to 4,000 may be infected, according to Xinhua.

Twenty-nine patients are still hospitalized, mostly young children, with five in intensive care. Two unvaccinated boys, aged 18 months and two years, have died.

A nationwide vaccination campaign launched in May has delivered over 142,000 doses. In outbreak-hit cities, residents — including visiting infants — can now get immediate vaccinations without appointments.

Measles is highly contagious and, while often mild, can cause severe complications and death, Xinhua reported.