When ASHRAE published the first edition of Standard 188, Legionellosis: Risk Management for Building Water Systems, there was a question of: “What about other pathogens? Why concentrate on Legionella?”
In defense of ASHRAE, the reason ASHRAE 188 only addressed Legionella is because that is the scope of the standard. ASHRAE 188 has been largely ignored by the plumbing profession. Every attempt to reference the standard directly into the plumbing codes has not been successful.