Here is my answer to previous post:
Malaria has been eradicated in Ecuador — no need for anything to combat it. You can get the vaccine for Yellow Fever if you like. As of yet, there is no vaccine for dengue. It’s best to use repellant as screens on windows, etc.
If you go to the CDC website, you will see their recommendations. I think they say to get a tetanus booster and Hep A and B series, Yellow Fever if you will be going into the jungle. (Which you won’t.)
I can’t tell you what to do. Only you can decide. If it were me and I were only coming for a visit, I would not bother. Unless… you will fly directly to Costa Rica from Ecuador. Costa Rica insists that if you’ve immediately been in a country with ANY threat of Yellow Fever and you are traveling directly to CR you MUST have proof of a Yellow Fever vaccination.