What kind of seedlings should be used to get a yellow book in Africa?

When you go to Africa to get a yellow fever certificate, you need to get vaccinated against yellow fever. Yellow fever is relatively common in Africa, so people traveling, working or studying in Africa need to be vaccinated against yellow fever and obtain a vaccination certificate, also known as an international vaccination certificate for yellow fever vaccine (referred to as a yellow card or yellow book). Yellow fever is concentrated in Africa and South America. Yellow fever is commonly known as "Yellow Jack" and "Black Jack". It is an acute infectious disease caused by the yellow fever virus and spread through the bites of infected female mosquitoes. The vaccination must be completed within 10 days before departure to be effective, and one vaccination can provide effective protection for up to 10 years. In some cases, such as those over 65 years old who are not suitable for vaccination, a certificate from the Entry-Exit Epidemic Prevention Station is required to prove their health status. This certificate is also valid when entering and exiting.