The mouse model for Dengue encephalitis has been widely usedfor the evaluation of vaccine candidates against Dengue [7–11]. Thisanimal model is based on the inoculation by the intracranial routeof a lethal dose of neuroadapted dengue virus. Between 7–10 daysafter the infection, animals develop disease signs like bristlinghair, lordosis, paralysis and finally death. They are observed dur-ing 21 days and the mortality and morbidity rates are recorded.This animal model has been very useful since it uses immuno-competent mice and the protective immune response induced byvaccine preparations is evaluated in vivo. However, it has some dis-advantages, the route for a viral challenge is quite different fromthe natural route of infection and the viral strains require severalpassages in mouse brains.