 Hello, I am Dr. Bhaskar Ashanay, Head of the Department of Pediatrics and Chief of Division of Pediatric Infectious Diseases at Manipal Hospital, Bangalore. Over a period of time, the studies have found that the immunity vanes after some time. So boost that immunity, we have to vaccinate the teenagers. Now there is a different concept called as adolescent vaccine itself, wherein the adolescents are given some vaccines, few are new vaccines which are given there, few are the old vaccine to boost the immunity. For example, we give DPT at 6 weeks, 10 weeks, 14 weeks, then 5 years and 10 years. Then now the adolescent vaccination of TD at 15 years we have to give, dipteria, pertussis and tetanus at a reduced dose we give, just to continue that protective effectiveness both to the person and to the society. The next thing which comes is in female children, it is the cervical cancer vaccine. Female children between 9 to 14 years are given this vaccine and if it is not taken to that age, you can even give to the any age after that, till 35 years. And whichever vaccines are missed in the earlier period can always be vaccinated during the adolescent period.