You did make me curious though- so I did a bit of Googling and found a few articles saying this:
'If you put something ridden with bacteria in the washing machine you will simply be swishing the germs around - creating a ‘bacterial soup’ - unless you do something to kill them.
'I am very concerned about bacteria from soiled underwear transferring onto items such as tea towels which are then used to wipe dishes,” says Dr Ackerley.
Items that are most likely to be contaminated with pathogens are those which come into direct contact with the body - underwear, towels, facecloths, bedlinen and nappies.,
So again, common sense need to prevail. I only wash things at 30C which are basically t-shirts, trousers, normal day wear- but pants too, and pyjamas, nighties - and careful separate washing. All towels, facecloths, dishcloths, teatowels, etc- at 50C. WHICH magazine says if you wash everyday stuff at 30C - you need to do at least one wash a month at 50C or 60C to clear any residue from washing machine.
But nothing about germs jumping greedily from WC as you flush.