Travel vaccines

I am planning a safari to Kenya and Tanzania. I was told I a may not be able to get some vaccines necessary for travel, such as yellow fever which is highly prevalent in Kenya. Tanzania has no yellow fever but would still require the vaccine to enter the country. I have a NHL MALT lymphoma in my eye which has been removed with cryosurgery 3 times.

What vaccines are prohibited for a person with this type of lymphoma? Also, I was told I cannot get the shingles vaccine as well. Thank you,
Gloria Meyers

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