One of the problems with dengue is that once you've been infected with one strain, getting infected with another one is much more likely to have serious consequ

One of the problems with dengue is that once you've been infected with one strain, getting infected with another one is much more likely to have serious consequences. That's a problem for people who travel for example. http://en.wikipedia.org/wiki/Dengue_fever http://en.wikipedia.org/wiki/Dengue_fever It is not entirely clear why secondary infection with a different strain of dengue virus places people at risk of dengue hemorrhagic fever and dengue shock syndrome. The most widely accepted hypothesis is that of antibody-dependent enhancement (ADE). The exact mechanism behind ADE is unclear.