How to best visually represent rate of loss data where participants lost to followup?




I am currently doing a hospital audit on the rate of loss of immunity to Hepatitis B in dialysis patients. This involves identifying 100 patients who are hepatitis B immune, and following them up every 6 months with a blood test to confirm persisting immunity, over 5 years. Due to the high mortality rate of dialysis patients, there is a significant number of patients that are lost to followup over this 5 year period (around 40). Some of these patients remain hepatitis B immune up until they are lost to followup, while others become non-immune and are then lost to follow-up.

How can I best display this data, taking into account those that are lost to followup, without affecting the results?

Thanks heaps