Vaccine Effectiveness, Burden and Impact Studies (VEBIS) of COVID-19 and Influenza – Tender Specifications OJ/2021/DPR/12924  DL 5.4.8. Review  adherence to case  definition by site and  draft report of  corrective actions The contractor shall review site-specific adherence to the syndromatic case  definitions, report on and implement corrective actions.  Comprehensive review of consistent adherence to the agreed ILI case definition,  and the syndromatic definition for COVID-19 cases. The format of the reports  shall be agreed with ECDC.  The contractor will be responsible for the implementation of the study according  to the study protocol. Datasets containing the collected data will be regularly  shared with ECDC. The contractor will be responsible for the timely delivery of  technical documents, of which the format will be agreed in advance with ECDC.  The contractor shall ensure that all study sites are performing the study activities  according to the agreed plan and will immediately report to ECDC in case of any  issue or challenge in the implementation of the study.  Once during year 2  Word - ECDC template  DL 5.4.9. Regular  laboratory results  summary table  The contractor shall provide a quarterly laboratory results summary table to  ECDC specifying the number of laboratory specimens processed and tested and  the proportion of positive samples by study site. All study should be tested  according to the EU/EEA protocol and country-specific SOPs with a validated  laboratory assay (such as polymerase chain reaction, PCR) and report regularly  overview results.  This deliverable includes all costs of sample processing, transport, laboratory data  management and the diagnostic assay and refers to cost of performing the  molecular diagnostic (i.e. RT-PCR) and serology. The national public health  authorities have access to ECDCs support for sequencing and antigenic  characterisation of both SARS-CoV-2 and seasonal influenza viruses, which should  be utilised, where relevant. ECDC will decide which countries to be offered  support.  It is expected that the contractor shall ensure that the laboratory components of  the study will be implemented in each study site according to the study protocol,  and that the epidemiological and clinical data will be collected using standard  Every four months Word or a suitable  electronic platform 