This disease is caused by four related viruses, which means a person can get sick from it up to four different times in their lifetime. Name that mosquito-borne illness.

Forty percent of the world's population lives in an area where Dengue is a risk, which is why it's a leading cause of illness in some of those areas. Though many will present with mild symptoms, one in 20 will develop severe Dengue which can become dire within hours and is a medical emergency.

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