[header] How to avoid getting dengue fever on a mission trip [title] Know what dengue fever is. [step] Dengue (pronounced as' den-gay') is a communicable disease (not contagious), transmitted to humans by the biting blood meal of an infected mosquito. Once infected, the person is sick for a period of days but carries the virus thereafter. 
This means that they will be immune to that strain of the virus, but infection with other strains can have drastic complications. It is caused by a virus from the family of flaviviridae and related to west nile virus and yellow fever.