I had assumed your infections were insertion-related.
25-50% of PWDs are staph carriers. Staph carriers are more subject to infections, in particular insertion-related infections, and are supposed to undergo a special regimen to avoid such infections with Dexcom and pump insertions. They can involve, among other things, the use of other disinfecting agents beyond alcohol (such as betadine etc.), extensive use of antibacterial soap, and special treatment for the nasal cavities.
I imagine that other MOs may be applicable in general if you are a staph carrier, but I don’t know them.