Sema Mandal (MBBS, MRCP, MSc FFPH) has been a medical consultant epidemiologist in Public Health England (PHE) since 2013, where she is the lead for viral hepatitis in the Immunisation, Hepatitis and Blood Safety Department in the National Centre for Infectious Disease Surveillance and Control. Sema is the PHE lead for the introduction of universal hepatitis B immunisation into the routine childhood programme in 2017 and is responsible for establishing a PHE led, but cross-agency, National Strategic Group for Viral Hepatitis. She is the editor of the forthcoming first PHE report on Hepatitis B in England. In addition to her lead role in strategic and responsive work in PHE, Sema is a co-applicant and PI on several hepatitis health protection research projects and is an honorary senior clinical lecturer at UCL. During the 2014-15 West Africa Ebola epidemic Sema was seconded to WHO Geneva as a co-investigator on the successful “Ebola- ca suffit!” phase III rVSV-EBOV vaccine trial in Guinea. Prior to joining PHE’s national immunisation and hepatitis team, Sema spent 4 years at the US Centers for Disease Control (CDC) in Atlanta working on national and international immunisation programmes for bacterial vaccine preventable diseases. Along with leading the field response to multiple domestic outbreaks, she led projects in sub-Saharan Africa (Burkina Faso, Mali, Nigeria and Niger) on meningitis surveillance capacity building and vaccine evaluation studies. Sema completed specialist registrar training in public health in London, followed by the Epidemic Intelligence Service (EIS) Fellowship at CDC, Atlanta. Prior to entering public health, she worked in internal medicine, GUM and A&E in the UK and Sydney, Australia. She also joined Médecins sans Frontières and worked as a field medical doctor in hospital paediatric and primary care support programmes in Wau, South Sudan. Sema is thrilled to return to Brazil after first experiencing the country 20 years ago as a medical student on elective in Santarem, Para.