dengue hfmd are all treated like the common flu nowadays as a normal occurrence...going to add in dengue and measles soon...and please dont blame the fts they see a hole get aroused and just apply to go in nothing more..
Clusters? That's pretty much the whole Island. The areas where there are no clusters are the places which are not residential eg Changi airport, Jurong/Tuas Industrial zones and the catchment area.