Judgment of the Court (Fourth Chamber) of 20 May 2021.#Azienda Sanitaria Provinciale di Catania v Assessorato della Salute della Regione Siciliana.#Request for a preliminary ruling from the Corte suprema di cassazione.#Reference for a preliminary ruling – State aid – Agriculture sector – Slaughtering of animals affected by infectious diseases – Compensation for farmers – Notification and standstill requirements – Article 108(3) TFEU – Concepts of ‘existing aid’ and ‘new aid’ – Regulation (EC) No 659/1999 – Exemptions by categories of aid – Regulation (EU) No 702/2014 – De minimis aid – Regulation (EU) No 1408/2013.#Case C-128/19.