There's already a process and standard, internationally-recognized certificate for Yellow Fever vaccination, overseen by the WHO. Some countries check this boo

There's already a process and standard, internationally-recognized certificate for Yellow Fever vaccination, overseen by the WHO. Some countries check this book at the border. The certificate booklet has space for other vaccinations. Booklet: https://tourseastafrica.files.wordpress.com/2014/05/yellowcard.jpg https://tourseastafrica.files.wordpress.com/2014/05/yellowca...