How dangerous are insects from rotten food?

Hi, my wife bought a bread making machine some time ago and after using it a few times we simply got bored and went back to buying shop baked bread. This morning i noticed that the bread maker had dust all over it, but when i investugated it more closely, i found to my horror it was covered in thousands of tiny insects! Somehow, the lasy time it was used, no-one actually took out the loaf and its been rotting away ever since. Now I know this is disgusting and beleive me when I say that both I and my wife are horrified, but I am really concerned about these bugs. I’ve cleaned everwhere i can with bleach but AND I REALLY HOPE ITS A CO-INCIDENCE but i’v been suffering with breathing problems / chest infections for about a month. Could these 2 things be related?