Remember reading a hospital manual that was printed by and for doctors, from around 1920's or so. One section dealt with hospital laundry (buidling, design, practices, etc), and it clearly recommended wash temperatures of no more than 140F, held for ten minutes as good enough for most general hospital laundry. Wash was proceeded by a warm water "pre-wash", and obviously items from infectious wards were handled differently.
Sudsman is correct, "disenfection" of laundry by temperature is not very accurate as one has no idea what bacteria one is trying to kill, and different germs are killed at different temperatures. Some "germs" can withstand 180F and above temperatures. Chemicals are much better way to go.
Being as all this may, simply laundering textiles in warm or hot water along with a good detergent or soap goes a long way towards "germ free" laundry. The buggers are disloged from laundry and flushed down the drain, alive, but still away from one's laundry.
What one wants to do is remove the muck and filth germs feed upon, from one's laundry, that is what is important. We keep our persons and households clean to reduce places for germs to get a foothold, same with laundry.