Propionibacterium

Fermentation produces propionate and acetate, and often gas, catalase positive.
Willey et al. 2023 McGraw Hill, USA, ISBN 978-1-265-12303-1

The genus Propionibacterium includes gram-positive bacteria (rods).
Macfarlane et al. 1995 In Gastrointestinal and Oesophageal Pathology, 2nd ed., pp. 249-274 [R Whitehead, editor]. Edinburgh: Churchill Livingstone

The bacteria are primarily saccharolytic and lactate fermenting bacteria that metabolize sugar, starch, cellulose and produce acetate, and propionate. Macfarlane et al. 1995 In Gastrointestinal and Oesophageal Pathology, 2nd ed., pp. 249-274 [R Whitehead, editor]. Edinburgh: Churchill Livingstone

see also:
Acetate & Propionibacterium
Propanoate Metabolism / Propionate / Propionic acid & Propionibacterium