Grading many exams without getting sick I'm not sure if this question is on-topic here, but I imagine lots of people here deal with this problem.

In a few weeks, I'll have to grade about 500 exams. I'll receive them in paper form, and I need to give out the grades fairly quickly.

The last time I did this, I got the worst cold of my life and was totally incapacitated for the next week. What precautions can I take to make sure this doesn't happen again?
Wear a surgical mask and nitrile or latex gloves. Do not touch your face while working. Take frequent breaks to walk away from the pile.