Your doctor can provide you with immunization advice for Zambia, but you should also ensure you’re up to date with the recommended vaccinations for your home country. You can also check the recommended vaccinations by visiting the Government of Canada - travel vaccinations website.
If you’ve been to (even if just in transit) a country with yellow fever in the 30 days prior to your arrival in Zambia, you’ll need a yellow fever vaccination certificate or exemption certificate. Speak to your doctor before booking your trip as yellow fever vaccination is not always advised if you’re over 60.