At the time of a bad infection glucose levels can go up because of 2 main reasons. The first scenario is as a stress response and then this settles when the infection settles and subsequently the glucose is normal. The second scenario is in someone is an unknown diabetic, i.e already had diabetes but is unaware that they do, or is prediabetic(again unaware). With the infection the glucose levels can then go up further and then they are diagnosed for the first time. One potential way to sort out if the diabetes was there before is to do a blood test called an HbA1c at the time of infection and if it was above normal, then would suggest that the diabetes was there all the time.
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