The Listeriaceae are a family of Gram positive bacteria. The cells are short rods and can form filaments. They are aerobic or facultative anaerobic. Spores are not formed. It causes by human and animals listeriosis. ... Found on http://en.wikipedia.org/wiki/Listeriaceae
1) Gram-positive bacterium 
The Listeriaceae are a family of Gram positive bacteria. The cells are short rods and can form filaments. They are aerobic or facultative anaerobic. Spores are not formed. It causes by human and animals listeriosis. ...