electric hot water temperature

Greetings,

Mystery Pathogen ================= Since

is pretty clear preventing "Legionnaires' disease requires raising the temperature of water to at least

140°F" and "the thermostat can be set with an accuracy of ±5°F (±3°C) at best" I assume we are talking about a different pathogen being killed at a temperature setting of 120°F? A setting of 120° has the potential of keeping water in the tank a full 25°F below the temperature necessary to prevent Legionnaires' disease? Does anyone have a link where I can learn about that pathogen(s)? I don't doubt they exist because respected individuals have said that they do but would love some more information.

Mystery Pathogen = Legionnaires' Disease? ================= Is

wrong / misleading and only a setting of 120° F is necessary? Is Legionnaires' disease the mystery pathogen?

Thank you for your help, William