Answer:
The correct answer is option A. an immediate immune reaction to the initial infection with dengue virus.
Step-by-step explanation:
The dengue is the virus infected disease that is caused by dengue virus and transmitted by the aedes mosquito. The dengue fever and dengue hemorrhagic fever are two type of dengue. DHF or dengue hemorrhagic fever includes second stage of the fever with plasma leakage from endothelium of blood vessels.
Thus, the correct answer is option A. an immediate immune reaction to the initial infection with dengue virus.