Yellow fever certificates
Sort out your vaccinations a few months before you’re due to fly!
Note that it is compulsory to have a Yellow Fever vaccination in order to enter Tanzania, if you’re coming from a country where the disease is endemic (even if you were only transiting there, assuming you left the airport in that country for more than 12 hours). In the UK the Yellow Fever jab costs about £50-80 including a certificate to prove you’ve been vaccinated (and from what I understand it’s about US$80 for the vaccination in the States).
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