The interesting thing about parasite eggs hatching in the body is that it requires chemicals for this to happen.
Chemicals like isopropal alcohol and whatever is in perfumes etc. will weaken the shell of the egg before it passes out of the body and they hatch.
So it makes sense that a sick person will be quite wormy, because it will be the sick person that would have plenty of chemicals in the body.
A chemical free body should pass the eggs out without hatching.
A good reason to advise the person next to you to refrain from wearing chemicals. (perfumes)