Ok... cold medicine and coffee seems to have interesting side effects :-DD (But I hope you get well soon) And these mould on furniture problem I also had... someone had hammered unknowingly a nail into a pipe in the wall and for months water seeped into a wooden wardrobe 😱😱😱
But moulding yarn - a horrible image, I hope you will never have this problem again.
So, at least I wish you joy with your knew knitting needles and I am looking forward to the things (perhaps the blanket) you will make with them.