Hi Erin
Unfortunately, those of us with MS get sick just like the rest of the population - it's just unavoidable.
In most cases any MS symptoms triggered by a virus are usually as temporary as the virus. Once the virus is gone we will usually see improvement in the MS symptoms.
If after the virus is gone and you are still having an increase in MS symptoms then it would be a good assumption you are having a relapse.
Try not to worry overmuch at this point, Erin