All cotton has parasites. It is, after all, a natural organic product. Factories do some sterilization but only enough to make sure their product looks good. I always wash everything before I wear it and always have.
If you put on something new without washing it first you are just asking for it. You also have to think that most textiles are made in 3rd world companies that don't have soap or toilet paper in the bathrooms. If they have bathrooms. Just sayin.
You all would be surprised to know that medical equipment is NOT manufactured in a sterile environment. After manufacture it is placed in a sealed bag and then run through Gamma radiation.
It is suppose to kill everything. I don't believe it. Besides, it doesn't remove the hair or the boogers. Grosses me out.