Infection rates have risen in Israel, particularly in schools, since the Government began easing restrictions in mid-April.
The number of positive tests rose to 101 on Friday from four last Saturday and Prime Minister Benjamin Netanyahu will meet ministers and senior health officials over the weekend to decide whether to again close schools for some grades.
Breaking into a public holiday to sound a note of caution, Health Ministry director general Moshe Bar-Siman-Tov said some people had not been vigilant enough regarding social distancing, hygiene and wearing masks.
Though the number of daily tests has not changed, the rate of positive results has jumped to 1.5 per cent from 0.5 per cent, he told reporters.
“Sadly the disease is still here,” Mr Bar-Siman-Tov said.
“The atmosphere of loosening up among the Israeli public is out of place.
“I understand there are complaints that we have one policy and then change it, but that is how it works around the whole world.”