Mathieu Roche will present his latest analysis on how to use terminology and text mining for event-based surveillance systems (i.e. disease-based and symptom-based surveillance). He will discuss 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 is 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.