Thank you for your post Eric.
Kidney infections are very common and of course can put blood sugar levels into a more unstable condition, just like most illnesses when you have diabetes.
DRWF have a really handy leaflet called 'Tips to manage diabetes when you are ill'. Follow the link below to download it online or request your set of leaflets. There are 7 in the DRWF range at present. Hope this helps!
http://www.drwf.org.uk/Information/DiabetesWellnessLeaflets.aspx
Best Wishes,
ED.