I'm no expert either, but I am a childhood leukemia survivor myself. I've always heard that the long term effects of chemo aren't really understood yet (maybe they are more now....I'm about 25 years removed from treatment). But, I personally haven't experienced getting sick at an increased level. Colds maybe a couple times a year (usually due to proximity of children), never got the flu. Covid is a different animal though. Got it, appreciate the insight. Would also wonder if there's a difference in terms of when you went through cancer/chemo....as a child, your immune system is still developing, getting stronger. Going through cancer at 19 (Rizzo) or 22 (Lester) when there isn't much growing to do could be different. To your experience, I can't remember either Rizzo or Lester battling illness at any point (more of a KB thing) so maybe it's not really something to worry about. I asked my doctor friends and they really said it depends on the cancer and what stage it's at and the specific chemotherapy/cycles and the health of the patient before they undergo treatment. Many do suffer long-term side effects, but some side effects do go away like anemia. It's really a case-by-case thing, but some young patients do make a full recovery and you would never suspect they had a childhood cancer if you met them. A good friend of mine had testicular cancer when he was a teenager, caught it early and consulted doctors, underwent chemo and now he's not in a high-risk category for COVID-19 as an adult. I believe his immune system is perfectly fine, but he does have some GI issues.