It is affecting all of the ABC islands. I'm a travel agent, and I specialize in dive travel. While I am not a physician, I am advising all of my clients who travel to endemic areas, to see a doctor in order to at least get doxycycline or malarone and to use appropriate bug spray as a preventative. It won't keep me from traveling, but I believe that with forums such as this, we can be proactive, educated, stay safe, and tell the diving/traveling populace. Good advice from Swamp Doctor is that we need to report it to the appropriate agencies!
Even my cruise clients who believe they aren't at risk with simple stops in Belize, Mexico or Honduras need to take precautions because the shore excursions are often in jungle environments (i.e., Altan Ha, Belize zoo, ziplining, hiking, mangrove tours, cenotes, etc.)
If you believe you have contracted dengue, you definitely need to see a doctor (see Swamp Doctor's advise). My husband's blood and platelet levels were so skewed that it was affecting his liver and kidneys.