is nearly always associated with secondary antibody response. This response is one
elicited to a repeat stimulation with antigenetically related antibodies, most likely
other dengue serotypes. The primary infection which might even be asymptomatic sets the
stage for an allergic response from a subsequent infection that may be very serious. In
cities, migrants and other poor people without piped water and good garbage disposal are
much more often infected than better intergrated social neighborhoods. Old tires and
discarded containers as mosquito breeding grounds are notorious.