Anaerobic bacteria: Bacteroides 27%, 24.4% Fusobacterium nucleatum, Peptostreptococcus 27%, Gram possitive bacilli 18.9%, Gram negative cocci 2.7%.
Vi khuẩn kỵ khí: Bacteroides 27%, Fusobacterium nucleatum 24,4%, Peptostreptococcus 27%, trực khuẩn Gram (+) 18,9%, cầu khuẩn Gram (-) 2,7%.