There is no risk of yellow fever in Zimbabwe but you will need to show a yellow fever certificate if you have entered the country having visited another country with yellow fever risk.
It’s advised that travellers to Zimbabwe have updated vaccinations for tetanus, diphtheria, polio and hepatitis A, as well as vaccinations for typhoid, cholera, hepatitis B and tuberculosis. The rabies vaccination is recommended if you’re going to have contact with animals or if you’re going to be in a remote location far from medical assistance.