English: open incident
Welsh: achos agored
Subject: Amaeth
Welsh definition: bTB incidents remaining under bTB restriction at the quarter end. This comprises new incidents and incidents persisting from previous reporting periods.
Welsh context: Mae’r siartiau bar yn dangos nifer yr achosion agored fesul chwarter ers 2010 (22 o chwarteri). 
Plural: achosion agored
Notes: Term ar gyfer y Dangosfwrdd bTB yn benodol.