This is a test of commonsense. Complete the next sentence:

How to prepare for kidney dialysis 
Make sure your vaccines are up to date. 
Whether you are using peritoneal dialysis or hemodialysis, all people with end stage kidney failure should be up to date with their vaccinations to help reduce the potential for infection and illness. 
End stage renal disease affects your immune system.
The mortality rate is as high as 20% per year for people undergoing dialysis and the major causes are cardiovascular disease and infection. The dysfunction of the immune system is induced by uremia, or higher levels of urea in the blood system.