RESUMEN
Objective To explore the immunization of category B vaccine and its influencing factors among children aged 0 to 6 in Hangzhou City. Method We carried out an investigation with 685 parents of children aged 0 to 6 from January to February in 2017 by using stratified random sampling method. Statistical method was used to analyze the knowledge, behaviors and attitudes towards category B vaccine, and logistic regression was applied to explore the determinant factors of category B vaccine behavior. Results 670 parents were under actual survey, 467 children have been vaccinated at least one kind of category B, which accounts for 69.70％ and the rates of five main types of vaccine were lower than 30％. Logistic regression showed that people of citizen (OR=1.54, 95％ CI: 1.14-2.38) , able to distinguish category A or B vaccine (OR=2.05, 95％ CI: 1.26-3.33) , positive attitude towards category B vaccine (OR=2.46, 95％CI: 1.43-4.23), and higher affordable price (OR=3.15, 95％CI:2.07-4.80) were determinant factors of category B vaccine behavior . Conclusion The rate of category B vaccine behavior of children aged 0 to 6 is on a moderate level. The cognition and attitude of children' s parents on category A vaccine and category B vaccine have effect on the immunization status of category B vaccine among children aged 0 to 6 in Hangzhou.