Make them fire you if you don't want the tests. My job was doing the whole deep sinus swab until they hurt someone pretty bad...now it's self administered and they just want it somewhat saturated. I don't know about the composition of the swabs, only that some ethelene (eth oxide?) Is used to "sterilize" for packaging. I've been left with a scratchy throat afterward, moreso when they went deep. Maybe someone has thrown samples of different swabs under a microscope.