My fist place is the classroom, it can get very dirty because kids cough and sneeze all the time. You can get things like colds easily because your nose and mouth and nose have a lot of germs you can spread very easaly
you can get diseases like salmonella,norovirus and hand foot and mouth.
My second place is the bathroom. I picked this place because it can get very dirty in here. The toilets and sinks get dirty after so many people touch them and if you touch them and then go to lunch and put your hands on the food you eat you can get sick
My third place is the locker rooms, it can get very dirty in here because kids come in after they go to gym and they are all sweaty so it can get really dirty