It still puzzles me. I have been on TRT for almost 40 years, have a third of the immune system of most men, have had over 10 surgeries, and not a single infection. In fact, I think I heal faster than people I know. My hematocrit is never over 53. But we are all different.
I wonder if the men with higher infections were injecting on the hip or buttock close to the surgery area.
I swapped from ventro glutes to deltoids after my surgeries - i didn't want to go anywhere near the wounds just in case.