<s>[INST] What is dengue? [/INST] Dengue is a mosquito-borne viral infection causing a severe flu-like illness and, sometimes causing a potentially lethal complication called severe dengue. The incidence of dengue has increased 30-fold over the last 50 years. Up to 50-100 million infections are now estimated to occur annually in over 100 endemic countries, putting almost half of the world’s population at risk. Source: WHO. Link: https://www.who.int/vietnam/news/feature-stories/detail/dengue---questions-and-answers. Field: Infectious Disease. Disease: Dengue </s>