Notes on Listeria

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Genus: Listeria.

• Gram+; non-spore forming rod; tumbling motility.

• Facultative intracellular.

Listeria monocytogenes:

• Beta-hemolytic rod; cold growth; nonspore-former on blood agar.

• Found in animal GI and genital tracts, unpasteurized milk, plants and soil.

• Cold growth: soft cheese, deli meats, coleslaw.

• Transmitted by food, contact, and delivery.

Pathogenesis:

• Listeriolysin O (a beta-hemolysin) facilitates rapid escape before lysosome and phagosome fuse.

Diseases:

Listeriosis:

• Diarrhea in healthy adults.

• Fever and chills in pregnant women.

• Neonatal disease (granulomatosis infantiseptica) in babies.

• Septicemia and meningitis in immunocompromized people.

• Meningitis in patients with renal transplants.

Treatment:

• Ampicillin with gentamicin added for immunocompromized patients.

Additional Readings:

Basic Bacteriology

1. Bacterial Locations and Toxins
2. Growth Medias and Oxygen Requirements
3. Staphylococus
4. Streptococcus
5. Enterococcus
6. Bacillus
7. Listeria
8. Corynebacterium
9. Actinomyces
10. Nocadria
11. Mycobacterium
12. Clostridium
13. Neisseria
14. Pseudomonas
15. Legionella
16. Bordetella
17. Francisella
18. Brucella
19. Campylobacter
20. Escherichia
21. Shigella
22. Klebsiella
23. Salmonella
24. Yersinia
25. Proteus
26. Vibrio
27. Pasteurella
28. Haemophilus
29. Bacteriodes and Prevotella
30. Treponema
31. Borrelia
32. Rickettsia
33. Coxiella
34. Ehrlichia
35. Chlamydia
36. Mycoplasma
37. What is an ELEK's Test?
38. Causes of Orchitis
39. What is Leprosy?
40. What is Folliculitis?
41. What is Botulism?
42. How to interpret PPD (Purified Protein Derivative) results?
43. Prenatal Infections

Related Topics

1. Bacterial vs viral infections

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