Tanzania is mapped by the World Health Organization as a low risk country because no Yellow fever virus has been isolated in the country. However the Yellow fever vaccination is recommended for travellers going to Tanzania. Proof of the Yellow Fever vaccination is required if you are travelling to Tanzania from countries that have Yellow Fever Endemic. But also for travellers who transit in Yellow Fever Endemic Areas; only if the transit period at the airport is 12 hours or more.
Do I need a Yellow fever vaccination for my upcoming Tanzania trip?
It is always best to consult a qualified travel medical specialist on whether immunization is relevant in your case. If you are still not sure if you need a vaccination for your next Tanzania travel, you can also check the WHO website for updated information.