Vaccine Effectiveness, Burden and Impact Studies (VEBIS) of COVID-19 and Influenza – Tender Specifications OJ/2021/DPR/12924  countries/study sites which are implementing the protocols; datasets containing the  collected data will be regularly shared with ECDC. Such validation is foreseen on a  regular and constant basis over the course of the project (e.g every two weeks), and  will be complemented by an epidemiological data summary/report/bulletin delivered  with the relative frequency. The format of the reports will be agreed with ECDC. Task 3: Summarize findings related to the studies  The contractor will summarize findings related to the studies, which include delivering regular descriptive and analytical reports, draft manuscripts on  topics related to the studies vaccine effectiveness and impact studies using health registries, as well as prepare a set of presentations during the course of  the contract to support presentations of study roll-out and interim results to ECDC internal and external stakeholders. Deliverable (DL)  Description  Estimated  frequency/ Volume  File / form at type  DL 4.3.1. Regular  descriptive and  analytical report on  results on vaccine  effectiveness  Descriptive and analytical report. Deliverable includes scripts used to create the analysis report. Cumulative data  presented since the beginning of data collection. Format of the reports to be agreed  with ECDC during monthly conference calls.  The report should include descriptive data on study participants and recruitment.  The descriptive data should also be stratified by vaccine brand name, site, age  group, sex and other relevant variables. Vaccine effectiveness estimates against primary and secondary study outcomes  should also be included by compiling data from each study site and should be  stratified by vaccine brand name, site, age group, sex and other relevant variables.  Every four months Word - ECDC  template DL 4.3.2. Annual  descriptive and  analytical report Format to be agreed during monthly teleconferences. Cumulative data presented since the beginning of data collection. The report will  cover all studies and analysis performed within the lot.  On an annual basis  Word – ECDC  template 