Hi. It's by no means unusual. We all differ with our individual systems, conditions, meds and diet, but blood sugar does increase generally with an infection, with the wrong kind of bacteria doing its nasty stuff. Dehydration often comes along like a horrible cousin, so keep the fluid intake up. If meds were taken/are still being taken for the bug...that too can have an impact that lasts a week or more..particularly anti-biotics. Hopefully, things will settle down soon. If things are still much higher than usual for a while - see your doctor.