Research: Covid-19 cohort studies data harmonization, standardization, and processing for analysis of data-driven evidence of SARS-CoV-2 variants impact. Research aim: The project aims at developing data science methods for the integration of real-life data for monitoring of the COVID-19 pandemic and its variants. The project will also promote inter projects(external) clinical data harmonisation and standardisation among all Covid-19 cohort-based research studies at EU-Horizon and the COVID-19 European Data Portal.