This is a very serious health issue so check your house, clean the window frames inside your home regularly. One of my cousins got very I’ll from this and it has made me hyper vigilant about mould in my house. Luckily I painted my bathroom, toilet and laundry room using micro ban anti fungus paint a few years ago. Good ventilation is important.
This year we will have a damp summer and that means mould and fungus everywhere. So keep the anti mould cleaning up to speed.