Retrieve and Explore ERVISS Respiratory Virus Surveillance Data // Provides easy access to ERVISS (European Respiratory Virus Surveillance Summary) data from the EU-ECDC https://github.com/EU-ECDC/Respiratory_viruses_weekly_data. Enables retrieval, filtering, and optional visualization of data across European countries. Data is fetched directly from the EU-ECDC Respiratory Viruses Weekly Data repository, with support for both latest data and historical snapshots for reproducible analyses.