Talk about Listeria monocytogenes.

Facultative anaerobes, intracellular (invasive) they enternalize into the phagosomes and then to lysosomes where LLOs (listeriolysin O) will go out and may cause listeriosis, gastroenteritis, meningitis (they attack epithelia, macrophages and hepatocytes) (IP 1-90 days) may cause granulomatosis infantiseptica, IP 6-48 hours, and meningoencephalitis (for babies, elderly and immunosupressed) Treated by ampicillin (alone without clavulanic acid)