<unk>  is the most effective tool in preventing the transmission of<unk>  and HDV. Vaccines are composed of the surface antigen of<unk>  (HBsAg) and are produced by two different methods: plasma-derived and recombinant DNA. 
The primary hepatitis B immunization series conventionally consists of three doses of vaccine. Vaccination of infants and, in particular, delivery of<unk>  within 24 hours of birth is 90–95% effective in preventing<unk>  infection, as well as decreasing<unk>  transmission if followed by at least two other doses. WHO recommends universal<unk> tion for all infants and recommends that the first dose be given as soon as possible after birth. This strategy has resulted in a dramatic decrease in the prevalence of CHB among young children in regions of the world where universal infant vaccination programs have been implemented. A proportion of vaccinated children (5–10%) have a poor response to vaccination, and will remain susceptible as adults to acquisition of<unk>  infection. WHO recommends that<unk>  be included in routine immunization services in all countries. The primary objective of hepatitis B immunization is to prevent chronic<unk>  infections, which result in chronic liver disease later in life. By preventing chronic<unk>  infections, the major reservoir for transmission of new infections is also reduced.
Hepatitis B vaccine
Caries vaccine
Hepatitis E screening
HIV vaccine
Hepatitis B screening
Polio vaccine
Influenza vaccine
Influenza vaccine 