I think you should call the interviewer, and ask what they would prefer. If that doesn’t work, I would try very hard to reschedule. If that doesn’t fly, I would just go, and apologize. If you have no other choice, attending would be nicest if you did keep a tissue to your face, and have some hand sanitizer handy to use, and also share, if they wish. Man. What a tough break. I am so sorry this happened like it did.