In reply to your post Bluemon58 is quite correct "Yellow Fever Vaccine", Issues to be aware of:
Get your Yellow Fever Vaccine before you travel to Nigeria $50
You will be issued with a " Yellow Fever Card" with your "Yellow Fever Vaccine", you will be asked to show this (so keep it on your person) along with your Passport at Lagos Airport on Arrival, prior to Nigerian Immigration.
Note: If you fly directly from Africa (not via Dubai or other hub) to Bangkok, you must go directly to the Airport Medical Centre (prior to Immigration on the left) and fill out a Medical Form and show your "Yellow Fever Card", then proceed to Thai Immigration.
No, "Yellow Fever Card", No Entry.............Simple, (or they'll insist on another Yellow Fever Jab and charge $100+)
Good luck with Nigeria, there nice people,,