I thought chlorine does kill the nasties. The temperature thing is simply a time factor - the cooler the temperature the longer you have to wait.

Boiling for 10 minutes does not make sense to me unless you want to cook the nasties for supper. The water does not get any hotter after boiling starts. A rolling boil should indicate that all water is of the same temperature. When you dump crabs in a pot they are dead quite quickly. Are viruses and bacteria different?