  Dengue is a serious health problem in the Philippines. In 2016, the
Department of Health of the country launched a dengue vaccination campaign
using Dengvaxia. However, the campaign was mired with controversy and the use
of Dengvaxia was banned in the country. This study proposes a mathematical
model that represents the dynamics of the transmission of dengue with its four
strains. Considering that the Dengvaxia vaccine was intended to be given only
to people aging from 9 to 45 years old, the human population is divided into
two age groups: from 9-45 years old and the rest of the population. Using this
model and optimal control theory we simulate what could have been the effect of
Dengvaxia in the number of dengue cases and then compare this with the other
usual dengue intervention strategies. Results show that the best implementation
of the usual strategies is better than that of Dengvaxia.
