The Italian death rate is due to an overwhelmed health care system.
It is irrelevant to the operation of critical infrastructure.
The _only_ number that matters is the percentage of workers who will get critically ill.
So here are the Italy numbers:
1.518 serious/critical out of 21,157 cases = 7% which would be 7 workers off the floor in a plant of 100 people.
If one of the seven dies, or all seven die, it does not have any impact on plant operations.
I also assumed that Italy is failing to test/count a whole bunch of people with no symptoms...even though their test rate is higher than any other country at this point.
Anybody with no symptoms works—and works until they drop.