Dengue hemorrhagic fever is caused by ?
Ans. is `d' i.e., Infection with more than one dengue virus DENGUE FEVER Dengue fever is caused by arboviruses (at least 4 serotypes have been recognized) It is transmitted by Aedes (Aedes aegypti is the main vector). The reservoir of infection is both man and mosquito. The transmission cycle is Man-mosquito-man Dengue fever occurs both epidemically and endemically. Epidemics stas in rainy season and are usually explosive. Aedes mosquito becomes infective by feeding on a patient from the day before onset to the 5th day of illness.
Infection with more virulent dengue virus
Infection with same dengue virus repeatedly
Infection with dengue virus in immunocompromized host
Infection with more than one dengue virus