Dengue virus, a member of the flaviviridae family, is transmitted principally by the Aedes aegypti mosquito. Dengue, an emerging disease of global importance, is characterized by four antigenically related serotypes (Dengue 1–4), where infection with one serotype provides life-long immunity to that dengue serotype but not to other serotypes. Dengue results in a spectrum of clinical presentations, from subclinical infection to severe hemorrhagic disease. Dengue fever, which is usually benign and self-limiting, is characterized by sudden onset of high fever, chills, severe headache (mostly frontal or retro-ocular), skin rash and general malaise. Two distinct clinical entities, dengue hemorrhagic fever (DHF) and dengue shock syndrome (DSS), have been associated with poorer outcomes, with mortality rates approaching 5% (Seet, R. C., Quek, A. M., & Lim, E. C. (2007).

According to the World Health Organization (WHO) approximately 2.5 billion people, or two-fifths of the world’s population, are now at risk from dengue. The disease is now endemic in over 100 countries. Dengue hemorrhagic fever is a leading cause of serious illness and death among children in some Asian countries. (Mishra, S., Agrahari, K., & Shah, D. K. (2017).

A symptomatic episode usually comprises a febrile phase (with fever of at least 38.5°C), a critical phase around defervescence (which may include hemorrhagic manifestations and/or dengue shock syndrome), and a recovery or convalescent phase. However, some dengue patients present persistent symptoms including fatigue, depression, and weight loss after the recovery phase, a possibility acknowledged by the World Health Organization (WHO) since 1997 (Tiga, D. C., Undurraga, et al. (2016). Also dengue virus results in a spectrum of ocular manifestations, ranging from non-specific symptoms to severe retinal hemorrhages. (Seet, R. C., Quek, A. M., & Lim, E. C. (2007).

In dengue fever intake of proper diet with liquids results in better nutritional status, increased appetite and balance electrolytes. Diet therapy is very helpful in recovering from dengue, good nutritional status, increased appetite and increase RBC count and balanced electrolytes. (Mishra, S., Agrahari, K., & Shah, D. K. (2017).

A retrospective study was carried out for a period of 6 months from November 2017 to April 2018 with the objective to analyze the effect of vitamin C in the management of Dengue fever in the tertiary care hospitals of selected three states of India (Tamil Nadu, Kerala, and Madhya Pradesh), the patients who were administered with Vitamin C had a greater percentage increase in their platelet count and a shorter duration of hospital stay. Study indicates that there exists an association between Vitamin C intake and length of hospital stay (Ramalingam, K.,et al.(2019).