If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email email@example.com.
Please tell us what format you need. It will help us if you say what assistive technology you use.
Surveillance of hepatitis B and C is necessary to prevent and control its spread. Investigation and case follow up, as outlined in this guidance, aims to assess risk factors and detect outbreaks (all of which should be notified to PHE).