#what is listeriosis #,listeria monocytoges ,#what is the mode of transmission,#food-born infection ,#vertical infection ,#early and late onset ,#meningitis و#Sepsis ;#Early vs.Late onset neonatal listeriosis ,diagnosis of neonatal listeriosis ,treatment of neonatal listeriosis ,prevention of neonatal listeriosis
3. Listeria monocytogenes (Cont.)
Listeria monocytogenes is a facultative
anaerobic bacterium, capable of surviving
in the presence or absence of oxygen
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5. Listeria monocytogenes(Cont.)
Listeria monocytogenes is a Gram-positive
bacterium
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Ramaswamy V, Cresence VM, Rejitha JS, Lekshmi MU, Dharsana KS, Prasad SP, Vijila HM
(February 2007). "Listeria--review of epidemiology and pathogenesis“ Journal of Microbiology,
Immunology, and Infection = Wei Mian Yu Gan Ran Za Zhi. 40 (1): 4–13.
Pizarro-Cerda J, Cossart, P (2019). "Microbe Profile: Listeria monocytogenes: a
paradigm among intracellular bacterial pathogens". Microbiology. 165: 719–721.
6. Listeria monocytogenes(Cont.)
Twenty to 30% of foodborne listeriosis
infections in high-risk individuals may
be fatal
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Ramaswamy V, Cresence VM, Rejitha JS, Lekshmi MU, Dharsana KS, Prasad SP, Vijila HM
(February 2007). "Listeria--review of epidemiology and pathogenesis“ Journal of Microbiology,
Immunology, and Infection = Wei Mian Yu Gan Ran Za Zhi. 40 (1): 4–13.
Pizarro-Cerda J, Cossart, P (2019). "Microbe Profile: Listeria monocytogenes: a
paradigm among intracellular bacterial pathogens". Microbiology. 165: 719–721.
7. Listeria monocytogenes(Cont.)
Listeria monocytogenes is the third-most
common cause of meningitis in newborns.
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"Listeriosis (Listeria infection)"www.health.ny.gov. Retrieved 2015-11-16.
9. Pathophysiology(Cont.)
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Aspiration or
swallowing of
amniotic fluid
or vaginal
secretions
Inutero or
perinatal
infection of the
lungs
Respiratory
distress, shock,
and a fulminant
course
10. Epidemiology
Pregnant women typically acquire listeria
infection from ingestion of contaminated
food
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11. Epidemiology(Cont.)
Many foods can harbor and transmit L.
monocytogenes,
• Infection usually occurs via ingestion of: .
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Contaminated
dairy products
Meats
Raw
vegetables
Refrigerated foods that require
no cooking before they are
eaten
12. The infection by L. monocytogenes in vivo: bacteria, via
contaminated food product, reach the intestinal barrier,
cross it, and then disseminate to the brain and placenta
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https://www.pnas.org/content/108/49/19484
13. Symptoms and Signs
• Infections in pregnant women:
May be asymptomatic
Or characterized by a primary
bacteremia manifesting first as a
nonspecific flu-like illness.
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14. Symptoms and Signs(Cont.)
• In the fetus and neonate
Clinical presentation depends on
the timing and route of infection.
Abortion, premature delivery with
amnionitis, stillbirth, or neonatal
sepsis is common.
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15. Neonatal listeriosis
Two clinical presentations are
recognized :
1. Early-onset neonatal disease (<5
days)
2. Late-onset neonatal disease (≥5
days)
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16. Early – onset neonatal listeriosis
(<5 days, usually within 1-2 days
of birth) low birth weight
Predominantly septicemic form
Occurs with milder transplacental or
ascending infections from the female
genital tract
Mortality rate is ~ 20-30%
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17. Early – onset neonatal listeriosis
(Cont.)
A strong association with:
recovery of listeria monocytogenes from the
maternal genital tract
obstetric complications
prematurity
neonatal sepsis with multiorgan involvement,
including rash BUT without CNS localization
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18. Late-onset neonatal listeriosis
( >5 days, mean14 days of life but before 30
days of age)
Predominantly meningitis form (purulent with
parenchymal brain involvement
Affected infant frequently are full-term
The mothers are culture-negative and
asymptomatic
If adequately treated ,the mortality rate <20%
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19. Early-onset vs. Late-onset
No. Features Early-onset
(<5 days)
Late-onset
(≥5 days)
1 Maternal listeria culture Positive Negative
2 Obstetric complications Present Absent
3 newborn Premature
delivery
Term delivery
4 Birthweight Low Normal
5 Neonatal infection Neonatal sepsis Neonatal meningitis
6 Mean age at onset 1.5 days 14.5 days
7 Mortality rate > 30% < 10%
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Benitez-Segura I , Fiol-Jaume M , Balliu PR ,Tejedor M. Listeria monocytogenes:
maculopapular rash may be the clue. Arch Dis Child Fetal Neonatal Ed.2013;98 (1):F64
20. • A sick neonate whose mother has
listeriosis should be evaluated
for sepsis, including cultures of either
umbilical cord or peripheral blood,
CSF, gastric aspirate, meconium and
any potentially infected tissue,
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21. Diagnosis
CSF examination may show a
• predominance of mononuclear cells
• usually polymorphonuclear cells
predominate.
• Gram-stained smears frequently are
negative but may show pleomorphic,
gram-variable coccobacillary forms
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22. • Laboratory confirmation of the
organism involves biochemical testing
and observation of motility using a
slide test or showing motility in
semisolid media
• Molecular detection via PCR is
available in certain laboratories
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Diagnosis ( cont.)
23. Listeria monocytogenes are gram-positive rods (three white
arrows) of variable size, shape, and length, which is somewhat
evident in this gram-stain of a blood culture.
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https://www.pinterest.com/pin/4939892714863324
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24. Prognosis
• Mortality, ranging from 10 to 50%,
is higher in neonates with early-
onset disease
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25. Treatment
• Treatment of the newborn is with
ampicillin plus an aminoglycoside
• A 14-day course is usually
satisfactory (21 days for meningitis),
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26. Other possible drugs
• Ampicillin or penicillin with rifampin
or trimethoprim/sulfamethoxazole
• Trimethoprim/sulfamethoxazole alone
• Meropenem
they have not been well evaluated.
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27. Other measurements
In heavy infection, drainage/secretion
precautions may be considered.
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28. Prevention
Food products that may be contaminated by L.
monocytogenes
should be avoided by pregnant women
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unpasteurized dairy
products
raw vegetables
soft cheeses prepared deli meats and
salads
refrigerated meat
spreads
Refrigerated smoked
seafood)
29. Prevention ( cont.)
• Proper food handling, in particular
separating uncooked meats from other
items during preparation and washing
hands, utensils, and cutting boards
after handling uncooked foods, is
critical.
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30. • infection during pregnancy is recognized,
treatment may then be given before
delivery or intrapartum to prevent vertical
transmission,
• ??the usefulness of such treatment
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31. References
Ramaswamy V, Cresence VM, Rejitha JS, Lekshmi MU, Dharsana KS, Prasad SP, Vijila HM (February 2007).
"Listeria--review of epidemiology and pathogenesis“ Journal of Microbiology, Immunology, and Infection = Wei
Mian Yu Gan Ran Za Zhi. 40 (1): 4–13.
Charlier C, Perrodeau É, Leclercq A, Cazenave B, Pilmis B, Henry B, et al. Clinical features and prognostic factors
of listeriosis: the MONALISA national prospective cohort study. Lancet Infect Dis. 2017 May. 17 (5):510-519
Mook P, Grant KA, Little CL, Kafatos G, Gillespie IA. Emergence of pregnancy-related listeriosis amongst ethnic
minorities in England and Wales. Euro Surveill. 2010 Jul 8. 15(27):17-23
• Pizarro-Cerda J, Cossart, P (2019). "Microbe Profile: Listeria monocytogenes: a paradigm among intracellular
bacterial paogens". Microbiology. 165: 719–721.
• Lamont RF, Sobel J, Mazaki-Tovi S, Kusanovic JP, Vaisbuch E, Kim SK, et al. Listeriosis in human pregnancy: a
systematic review. J Perinat Med. 2011 May. 39(3):227-36
Jackson KA, Iwamoto M, Swerdlow D. Pregnancy-associated listeriosis. Epidemiol Infect. 2010 Oct. 138(10):1503-
9.
[Guideline] Committee on Obstetric Practice, American College of Obstetricians and Gynecologists. Committee
Opinion No. 614: Management of pregnant women with presumptive exposure to Listeria monocytogenes. Obstet
Gynecol. 2014 Dec. 124 (6):1241-4.
Imanishi M, Routh JA, Klaber M, Gu W, Vanselow MS, Jackson KA, et al. Estimating the attack rate of pregnancy-
associated listeriosis during a large outbreak. Infect Dis Obstet Gynecol. 2015. 2015:201479.
• Benitez-Segura I , Fiol-Jaume M , Balliu PR ,Tejedor M. Listeria monocytogenes: maculopapular rash may be the
clue. Arch Dis Child Fetal Neonatal Ed.2013;98 (1):F64
•
•
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