http://www.oralhealthjournal.com/issues/PrinterFriendly.asp?aid=1000216528&RType=&PC=&issue=10012007

Necrotizing ulcerative gingivitis (NUG) is an acute bacterial infection caused by fusiform rods and spirochetes (Borrelia vincentii). When NUG progresses and results in attachment loss, it is referred to as necrotizing ulcerative periodontitis (NUP). Together, NUG and NUP are now classified as "Necrotizing Periodontal Diseases" according to the 1999 classification of periodontal diseases and conditions.1 Necrotizing periodontal diseases are also known as acute necrotizing ulcerative gingivitis (ANUG); ulceromembranous gingivitis; Vincent's infection and trench mouth.(AU)