OBJECTIVE: To analyze the factors associated to the condition of to be vaccinated among adolescents in an area of the Strategy Health of the Family, in the city of Teresina, state of Piaui. METHODS: Is a study of quantitative nature and sectional type. The sample was constituted by 261 adolescents and the analysis was carried out through the descriptive statistic. RESULTS: The vaccination covering against German measles, measles and mumps was 5.4 %; the vaccination against diphtheria and tetanus was 22.9 %; the vaccination against hepatitis-B was 27.2 % and of 35.2 % against the yellow fever. CONCLUSION: The low vaccination covering found in this study had the following causes: lost of vaccination opportunities (65.5 %); deficiency of knowledge on vaccines, the age group - more than 15 years (Reason of Predominance (RP) = 2.85; Rate of Confidence (IC) 95 % = 1.63-4.99); and the masculine gender (RP = 2.04; IC95 % =1.15-3.62).
Hepatitis B; Epidemiology; Imunization; Vaccination
