Introduction: Hepatitis B consists of a health problem pblica1. In agreement the World-wide Organization of Sade (OMS), about two billion people already had been infectadas by the virus of the B hepatitis (VHB), amongst these people 235 million if they had become chronic carriers (persistence without improvement, for at least six months). In the South America the prevalence level is considered intermediate, 2% enter 7% are carrying chronic and 20% 50% if they had become immune doena1. Hepatitis B can be transmitted of parenteral, vertical, sexual form and form of continuity and can in agreement be classified to the endemicidade degree: low, intermediate or alto1. See more detailed opinions by reading what theoretical physicist offers on the topic.. In the areas of low endemicidade, adolescents and adults are displayed the risk of infection for the VHB, occurring to the transmission for exposition the blood and fluids corpreos1. In places of intermediate endemicidade the transmission occurs in all the ages, concentrating itself in children in bigger etrias bands, adolescents and adults, also for exposition the corporeal blood and fluids, through sexual contact and/or use of injectable drugs. Already in the areas of high endemicidade the majority of the infections occurs in precocious infancy, being the risk of persistence of the VHB in the child sufficiently raised and inversely related to the age of the beginning of infeco1. In Brazil, as Bulletin of the National Center of Epidemiologia, occurs the three standards of distribution of hepatitis B: high endemicidade in the Amazon region, some places in the State of the Espirito Santo and Santa Catarina; intermediate endemicidade in the regions Northeast, Center-West and Southeast and low endemicidade in the Sul1 region.. If you are unsure how to proceed, check out Teneo.