Report from cognitive interview study to explore cohort participant's understanding of broad consent-related language communicated during the informed consent process.

Task 22 Ethical and cultural concerns regarding data and sample sharing are central to developing valuesbased ethical and appropriate informed consent practices Informed consent is of central importance to the ethical conduct of research principle of respect for persons and is important for enrollment and continuity of participation in cohort studies 1 5 A commonly used and widely accepted measure of consent for data sharing is broad consent wherein consent is obtained at the same time for the primary study as well as for sharing and future use of the data 6 The wording used for broad consent may explicitly state or imply that participants will not be recontacted when sharing their data 6 While several qualitative studies in lowand middleincome country LMIC settings have been conducted on the importance of consent for data sharing and the preferred methods for obtaining consent 1 35 7 very few have been conducted to assess participants understanding of broad consent 2 6 One study conducted in Thailand among clinical trial participants from whom broad consent was obtained showed that they did not clearly understand data sharing and had difficulty recalling the studyrelated information that had been shared with them previously 2 Broad consent for data sharing adds a layer of complexity to the consent process as it involves explaining concepts that are often abstract to the participants 2 We will conduct cognitive interviews with research participants who have consented to their or their childrens participation in longstanding dengue and Zika virus focused cohorts in three countries to explore their understanding of and agreement with the broad consentrelated language in each cohorts respective informed consent form ICF This research responds to the challenges faced by researchers and ethics review committees who must ensure the voluntary and informed participation in the research that they conduct or review