The present study is conducted in order to assess the acceptability of Hepatitis B vaccination in French general practitioners and peadiatricians before and after reimbursement of the paediatric vaccine InfanrixHexa. Two data measurement time points are planned, first before reimbursement and after reimbursement.

The aim of the study is to assess the acceptability of Hepatitis B immunization among general practitioners and open-care paediatricians. This is a national, repeated transversal epidemiological study with two data measurement time-points over a period of two years (T1 in 2009, T2 in 2011, two different samples of physicians) in order to assess immunization practices before introduction of the reimbursement of InfanrixHexa®, during the transition period and then during the period following reimbursement of the vaccine. At each collection time-point, two patient age groups will be investigated: 12-15 months and 24-27 months, thus providing measurements before/after reimbursement.

Inclusion Criteria:

• Children on the eligibility register complying with the investigator's immunization policy (children followed by the investigator since their birth, whose immunization regimen has been managed by the investigator).

Exclusion Criteria:

• Children on the eligibility register not complying with the investigator's immunization policy.
• Refusal of the patient.

An eligibility register will be kept throughout the inclusion period by the investigators. All children aged 12 to 15 months and 24 to 27 months, seen by the physician during this period, will be entered on this register General practitioners and open-care paediatricians drawn at random and agreeing to participate in the study.