Senator Richard Gordon on Saturday urged the Department of Health (DOH) to continue monitoring and testing 800,000 children who were given Dengvaxia.
In a statement, Gordon expressed concern over the children who were given the anti-dengue vaccine but have not had the disease.
Children who have never had dengue, according to Gordon, are at a higher risk of developing severe dengue or even dying if they acquire the illness now.
"If systems are not in place to immediately assist these children, we could lose so many of them. We are at a point where an outbreak threatens the lives of all the seronegative. Now is the time that we conduct studies on the efficacy of Dengvaxia and save as many children as we possibly can," Gordon said.
Gordon said the DOH and the Department of Education should check the vaccinated children since the DOH had already ordered public schools in the regions where the vaccination was conducted to go over the names of students who received Dengvaxia.
"Another important thing is, the DOH should be very patient in monitoring these children as dengue cannot be detected at an early stage. Sometimes, there are no warning signs. Malalaman mo na lang, malala na,” he added.
Reports of alleged deaths caused by Dengvaxia have spawned a scare that led to a drop in immunization coverage in the country from an average 70 percent in recent years to 40 percent last year.
Several cases have also been filed over the deaths of some who were injected with Dengvaxia, but it has not been established whether the fatalities were caused by the vaccine.