A few questions about T1 diabetes and being sick?

Quite often !! He has me check when I get up in the morning, before every meal then two hours after, before bed, if sugar is high two hours after correction dose. If there is a lot of vomiting or diarrhea ,Checking between bouts. Our immune system is compromised by the diabetes so it can be a little easier to get sick. But the better control we have, the stronger our systems are.