Am travelling through c america + Mehico avec my surfboard, will be heading to Panama too. Do travellers need a yellow fever certificate when going north after being in Panama??? (wont be going south of the canal, but it would be pretty impossible to prove that i hadnt been to Darien (regions with Yellow Fever) etc...if ever asked to at border crossings.) 
Hi Mark!
Welcome to TP!
Here are a couple of links that should help answer you question.
http://www.latinamerica.co.uk/health.htm
http://news24.wordtravels.com/Travelguide/Countries/Mexico/Health
Sounds like a fun trip. When does it begin?
Hi there,
Yellow fever certificate is needed in Honduras, Nicaragua and Panama.
Is that certificate required if only crossing from Guatemala to Copan Ruinas for two days and then back?
Thanks for the post. Got the vac along with others last week sometime.
- will be heading off in april- spending a couple of months staying mostly on the coast and then spend awee while in mehico- planning to be inspired on the way- not too many plans yet though!!
Yellow fever certificate is not needed in Central America--
I travel all over CA and into USA/Canada and Europe (live in Panama) and have never needed to show a Yellow Fever cert...
Some health authorities recommend it if you are going to the Darien jungle for extended periods...
cheers,
Andrew