WHO recommends standards for surveillance of vaccine-preventable diseases, including acute viral hepatitis.
WHO has also produced a publication on impact assessment through serosurveys. This may be done as a standalone method or as part of a broader evaluation of hepatitis B control. Surveys of this kind have been carried out in a number of areas of the world. The publication is a resource for countries wishing to carry out a hepatitis B survey and is primarily aimed at the lead investigator(s) to assist them in designing the surveys.
WHO-recommended surveillance standard of acute viral hepatitis
Documenting the impact of hepatitis B immunization: Best practices for conducting a serosurvey