Key aspects of the certificate Tanzania, and Zanzibar Visit
Purpose: The certificate is issued to verify that an individual has been vaccinated against yellow fever and to meet entry requirements for certain countries.

Yellow fever certificate Validity
While older certificates may have had expiration dates, all yellow fever vaccination certificates are now generally considered valid for life, including those with previous expiry dates.
Yellow Fever Issuance
The certificate is issued by a designated yellow fever vaccination center after the vaccination is administered.
Importance Yellow Fever
A valid yellow fever vaccination certificate is crucial for travelers heading to countries where yellow fever is present or where there's a risk of transmission.
Yellow Fever Replacement
If a certificate is lost, it may be possible to obtain a replacement from a vaccination center if the vaccination details (date and batch number) can be verified, potentially with an administrative fee.
Yellow Fever Medical Waivers
Individuals with medical contraindications to the yellow fever vaccine may be eligible for a medical waiver, allowing them to travel to countries requiring the certificate without it.
If your travel plans in Tanzania include outdoor activities, take these steps to stay safe and healthy during your trip.
Stay alert to changing weather conditions and adjust your plans if conditions become unsafe.
Prepare for activities by wearing the right clothes and packing protective items, such as bug spray, sunscreen, and a basic first aid kit.
Consider learning basic first aid and CPR before travel. Bring a travel health kit with items appropriate for your activities.
Heat-related illness, such as heat stroke, can be deadly. Eat and drink regularly, wear loose and lightweight clothing, and limit physical activity during high temperatures
Talk with your doctor about taking prescription or over-the-counter drugs with you on your trip in case you get sick.