Picture 10
This pciture shows Listeria monocytogenes in Gram stain.
Listeria monocytogenes
Morphology: colonies on blood agar produce a narrow zone of beta-hemolysis, Gram positive rod arranged in V- or L -shaped formations, organism shows tumbling movement, catalase positive, oxidase negative
Route of transmission: food, congenital
Investigations: Gram stain and culture
Diseases:
Pregnancy-associated and neonatal listeriosis
Meningitis
Food borne listeriosis
Treatment:
IV Penicillin/Ampicillin + Gentamicin
Trimethoprim-sulfamethoxazole (used in patients with penicillin allergy)