@ctack545 You asked about rituximab lowering your immunity. It may not, but you also get bendamustin which does affect the immune system. I found the following statement in my Drug book:
“Bendamustine affects your immune system. You may get infections more easily, even serious or fatal infections. Your doctor will need to examine you on a regular basis.
Common side effects of bendamustine may include:
fever, cough, mouth sores, trouble breathing;
low blood cell counts;
nausea, vomiting, diarrhea, constipation;
headache, tiredness;
rash; or
loss of appetite, weight loss.’
Most chemotherapy drugs will affect your immune system. If you are very concerned, you can have a discussion with your doctor.
Have you had any other infection that worry you?