I've been to Thailand many times and never heard about sandflies. Reaching info on Koh Kut/Koh Chang it looks actually we have here these sandflies. Topics in forum for this issue are quite old, is it still a problem? Why some people are saying there are sandflies and some no? Are them seasonal? I'll be there from 15 march 2014 to 22. Don't know if try this area or go in some "commercial" area :( to avoid sandflies. Any suggestion? I'd really appreciate. Many thanks everybody.