Officials in continental Europe’s major economies are closely monitoring coronavirus data for signs of a resurgence in infections as restrictions on daily life are phased out.

Countries must focus on more than daily case numbers and death tolls because they are lagging indicators. A better guide might come from the length of the lines outside the doctor’s office or surveys conducted at random.

Here is the situation in Germany, France, Italy and Spain, as lockdowns of varying degrees of severity are lifted…