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Yes, any infection affecting the body, will cause an increase in blood sugar levels. This is because your body releases some "counter regulatory hormones"' to fight the stressor, which in this case', is the viral infection. As a result, these hormones stimulate the liver
to release extra glucose
. And hence the raised blood sugar levels.
It would be advisable to keep a 3-4 hourly check on your blood sugar levels. If that is not possible, then it would be advisable to check it at least daily. If the episode of viral infection has completely subsided, then keep checking your sugar levels; especially if you have a family history of diabetes
or so. If the levels are consistently satisfactory, then you need not worry about diabetes, now. If not, do consult a diabetologist