Due to the ongoing uncertainty with international travel restrictions, the Scientific Committee have taken the difficult decision to cancel the IWHOD meeting, which was scheduled to take place in Seville, Spain 25th - 27th March 2021.  The plan is to delay the 2021 Workshop to 2022 so, please can we request you to keep these dates for your diaries - 24th to 26th March 2022 in Seville, Spain. 

To keep the IWHOD spirit alive, we are launching a series of webinars in 2020 and throughout 2021. 


12 July 2021     15:00 – 16:00hrs (BST)

COVID-19: the relevance of evidence to actions

Speaker Prof Sarah Walker 'The UK COVID-19 Infection Survey: reflections on the path from data to inference to action'.

Speaker Prof Dominique Costagliola 'Does it make sense to compare the strategies of management of the COVID-19 epidemic in the different countries in 2020-2021'?

Panellists: Prof Mary-Ann Davies, Prof John Gill, Prof Amy Justice & Prof Yukari Manabe.

Attendance is free but registration is mandatory.  

Please register here: https://ucl.zoom.us/webinar/register/WN_fqR3rwe6QoGKvsuOJf9NeA

We look forward to you joining us!


Previous webinar information

Watch webinar How HIV has helped us respond to COVID: voices from the frontline  26 April 2021  https://mediacentral.ucl.ac.uk/Play/63200 

Simon Collins (HIV i-base, London) interviewed HIV experts taking a lead: Prof Karine Lacombe (Clinician at St Antoine Hospital, Paris), Prof Andrew Boulle (Public Health specialist at University of Cape Town, Cape Town), Prof Miguel Hernan (Methodologist at Harvard T.H. Chan School of Public Health, Boston), Prof Roger Kouyos (Modeller at University Hospital, Zurich) and Prof Julia Del Amo (Policymaker at Ministry of Health and Social Policy, Madrid).

Watch Dragons’ Den 14 January 2021: https://mediacentral.ucl.ac.uk/Player/j713HfH7

Moderators: Dr Keri Althoff, Prof Caroline Sabin and Prof Jonathan Sterne.  Speakers Dr Christopher Rentsch and Michael Traeger presented on the work done following methodological discussions at the last Dragons’ Den session at IWHOD 2019 as follows:

  • Dr Christopher Rentsch: Comparing methods to investigate interactions between alcohol and neurocognitively-acting medications on the risk of health outcomes. 
  • Michael Traeger: Effect of PrEP initiation on STI incidence among gay and bisexual men: Exploring the utility of a target trial approach using surveillance data.

Watch webinar 16 October 2020: http://iwhod.org/portals/0/IWHOD Oct 2020-GSK_Tube_1080p.mp4

Chairs: Prof Marina Klein and Prof Stanislas Pol (IWHOD Scientific Committee members). Speakers and presentation titles:

  • Dr Daniela van Santen: Estimating trends in hepatitis C incidence among individuals attending primary care clinics that specialise in the care of people who inject drugs in Australia between 2009 and 2018.
  • Andreea Adelina Artenie: Diversity of detention patterns among people who inject drugs and the associated risk with incident hepatitis C virus (HCV) infection: Implications for hepatitis C prevention.
  • Mathieu Chalouni: HIV co-infection direct and indirect effect on the risk of non-liver-related cancers in HCV infected participants treated by DAA.


The International Workshop on HIV and Hepatitis Observational Databases (IWHOD) brings senior and junior HIV and hepatitis observational database researchers together to advance the methodology and analysis of observational data. No other workshop or conference devotes attention to the methodology of setting up and analyzing observational data, despite their importance in providing critical information on population outcome in real world settings outside the controlled setting of randomized trials. We are once again aiming to include attendees representing cohort studies from all regions. As in the past, we encourage discussion of work in progress, so all data presented will not be publicised outside of the Workshop..