Mathieu Roche, Senior Research Scientist and currently co-leader of the MISCA group (i.e. Spatial Information, Modelling, Data Mining, and Knowledge Extraction) at TETIS (CIRAD - France) presented the results of his latest analysis on how to use terminology and text-mining for event-based surveillance systems (i.e. disease-based and symptom-based surveillance). In this presentation Mathieu discussed the use of different datasets related to COVID-19, e.g. scientific publications, news data (PADI-web, MedISys), social media data (Twitter). The extracted terminology has been used (i) for surveillance systems (i.e. web crawling and information extraction tasks) and (ii) for spatio-temporal analysis of tweets dealing with COVID-19.