This is what I currently understand:
1. Moderna Booster is 1/2 dose of the original Moderna shot.
2. Phizer Booster is a full dose.
3. ESR Dialysis patients are only eligible for the 1/2 dose. Even though dialysis patients are somewhat immunocompromised, there are only 5 categories of patients who are considered immunocompromised eligible such as transplant patients for a full dose or two.
4. Does anybody else know anything different?