We invite researchers and clinical investigators to share their knowledge and experience by working in partnership with WWARN. To take part, you can share your data using a secure online system which accepts patient, sample or assay-level data in almost any format. You are invited to form or join a Study Group. Study Groups identify important research questions and then perform pooled or meta-analyses that are published in leading scientific research journals. To find out about data sharing and pooled analyses in other infectious disease areas, visit the IDDO website.