A rabies vaccination certificate signed by a licensed veterinarian must be submitted. (houstontx.gov)
Without a yellow fever vaccination certificate, you'll be denied entry to some countries - but what is yellow fever, and what do you need to know about the vaccine? (wanderlust.co.uk)
If your new cat is vaccinated when you first got him, do remember to get the relevant vaccination certificates from the place where you bought or adopted him from. (petsmagazine.com.sg)