On World Health Day 2014, WHO highlights the issue of illnesses spread by insects.

Thanks to modern advances in health care and disease control, traveling abroad is not nearly as dangerous as it once was: yellow fever can be prevented with a vaccination, Imodium will slow a gurgling gut, and bottled water can ward off everything from E. coli to cholera. However, there is one tropical disease that is not only increasing in prevalence, but also cannot be immunized against:…