What else lurks?

My sympathies to David Brown and his dengue attack (PostBag, Sept 7). I am just recovering from it too and slowly getting my stuffing back. Regarding the immunisation issue, I feel the same way, but just how effective is it and how long does it last, given that there are four to five strains? David’s observation about cost viability for the disadvantaged is spot-on and proliferating mosquito populations generated by extended rainy seasons, garbage pile-ups as well as neverending urban development projects are just exacerbating the situation.

Information prevention campaigns are all very well, and help, but it only takes one unlucky bite as we have experienced, and we are both old Thailand hands with no related problems in the past. What else is lurking out there? ROBIN