No abstract available.
Listeriosis*

No abstract available.
Animals ; Listeria* ; Listeriosis* ; Mice*

Background: Listeria monocytogenes is a food-borne intracellular bacterium which possesses many virulence factors that enable it to overcome the host immune system and of particular importance are surface proteins InlA and InlB which have a crucial role in initiating infection. The aim of this study is to detect the incidence of L. monocytogenes infection in placental tissue from women with spontaneous abortions by targeting InlB genes-based polymerase chain reaction. Methods: In one hundred and eleven pregnant women suffering from spontaneous abortions, about 25 grams of the placental tissue from each person was homogenized and centrifuged for about 15 min at 5000 rpm at 2-8°C. A specific set of primers was used for detection of L. monocytogenes InlB gene using conventional PCR technique. Results: Out of 111 placental tissue harvested from women with abortions, only 11 (9.9%) were proven to be positive for InlB gene. The highest rate of positivity (18.9%) was observed in the age group 20-29 years old. Of the 11 cases reported to be positive for listeriosis, 8 (72.7%) cases had their abortions in the first trimester. Conclusion Listeria monocytogenes may have a noteworthy role in pregnancy loss and should be considered when there are spontaneous abortions.
Listeriosis ; Listeria monocytogenes ; Abortion, Spontaneous

No abstract available.
Child* ; Humans ; Listeria monocytogenes ; Listeria* ; Listeriosis* ; Meningitis ; Sepsis

BACKGROUND: Listeriosis caused by Listeria monocytogenes has a high case-fatality rate (CFR) of approximately 20% to 30%. An increasing incidence of listeriosis has been reported in many countries recently. We investigated the annual incidence, clinical characteristics, and outcomes of listeriosis at three different hospitals in Korea and evaluated the effects of appropriate empiric antimicrobial treatments on patient outcomes. METHODS: We retrospectively collected the data of all culture-positive cases of human listeriosis from three hospitals of different sizes in Korea during 2006–2016 and calculated the annual number of cases and incidence per 100,000 admissions. RESULTS: A total of 58 patients with L. monocytogenes were included in this study. The incidence of listeriosis was significantly higher in 2013–2016 than in 2006–2012 (RR 3.1; 95% CI 1.79–5.36; P < 0.001), mainly because of an increase in patients over 60 years of age (RR 3.69; 95% CI 1.70–8.02; P < 0.001). Multivariate analysis showed that healthcare-associated infection (adjusted OR, 12.15; 95% CI, 2.56–86.01; P=0.004) and empirical treatment with first-line antimicrobial agents (adjusted OR, 0.08; 95% CI, 0.00–0.63; P=0.044) were associated with CFR. CONCLUSIONS: Healthcare-associated infections caused by L. monocytogenes are associated with high CFR. Adequate initial empirical treatments could reduce CFR, suggesting that careful consideration of an empirical antimicrobial regimen is warranted for elderly or immunocompromised patients admitted to the hospital.
Aged ; Anti-Infective Agents ; Humans ; Immunocompromised Host ; Incidence* ; Korea ; Listeria monocytogenes ; Listeriosis* ; Multivariate Analysis ; Retrospective Studies

China ; epidemiology ; Drug Resistance, Bacterial ; Electrophoresis, Gel, Pulsed-Field ; Humans ; Listeria monocytogenes ; physiology ; Listeriosis ; epidemiology ; Serotyping

Listeria monocytogenes is recognized as a significant foodborne pathogen, capable of causing listeriosis in humans, which is a global public health concern. This pathogen is particularly dangerous for pregnant women, as it can lead to invasive listeriosis in fetuses and neonates, posing a significant threat to both maternal and fetal health. Therefore, establishing suitable in vitro and in vivo models for L. monocytogenes placenta infection, as well as analyzing and exploring the infection process and its pathogenic mechanism, are important approaches to prevent and control L. monocytogenes infection in mothers and infants. In this study, we reviewed the in vitro and in vivo placental models used for studying the infection of L. monocytogenes in maternal and infant, summarized and discussed the advantages and limitations of each model, and explored the potential of in vitro cell models and organoids for the study of L. monocytogenes infection. This paper aims to support the study of the infection pathway and pathogenesis of listeriosis and provide scientific references for the prevention and control of L. monocytogenes infection.
Female ; Humans ; Pregnancy ; Listeria monocytogenes ; Listeriosis/prevention & control* ; Placenta/pathology* ; Public Health ; Infant, Newborn

Listeria monocytogenes is a facultative anaerobic, gram-positive bacillus. Listeria is commonly found in processed and prepared foods and listeriosis is associated with high morbidity and mortality. This bacterium is an important cause of severe infection in neonates and pregnant women. Pregnant women are at high risk for listeriosis, but symptoms are non-specific and diagnosis is difficult. Neonatal Listeriosis is generally a severe and fatal disease. There are two forms of the disease in the neonate, early- and late-onset, suggesting different modes of transmission. Generally, early detection and empirical treatment of listeriosis help to improve survival and prognosis. We explained two cases of L. monocytogenes sepsis with culture-proven in preterm and late preterm newborns from asymptomatic mothers. These neonates had fulminant clinical course even if standard antibiotics treatments were administrated.
Anti-Bacterial Agents ; Bacillus ; Female ; Humans ; Infant, Newborn ; Listeria ; Listeria monocytogenes ; Listeriosis ; Mothers ; Pregnant Women ; Prognosis ; Sepsis

OBJECTIVENeonatal listeriosis is a relatively rare but serious disease with a high mortality rate. This study was conducted to analyze the clinical features, treatment, and outcome of 6 cases with Listeria monocytogenes septicemia confirmed by positive blood cultures.

METHODSTotally 12,538 live births delivered in the hospital from January 1, 2004 to June 30, 2006 were investigated. Differences in the time of onset of the disease, clinical presentation, illness severity, laboratory data, management, and prognosis were compared between preterm and full-term infants.

RESULTSThe incidence of neonatal listeriosis was 4.8% in this study. All the cases with listeriosis were found to have early onset and the disease was transmitted from the mother to the fetus, 4 of the cases were delivered via cesarean section, 2 were born via normal spontaneous vaginal delivery. Maternal infection before parturition presented with fever in 4, diarrhea in 1; 5 had abnormal white blood cell counts and total neutrophil counts; 1 had positive result of Listeria monocytogenes in intrauterine contents culture. Three premature infants showed signs and symptoms of severe bacterial septicemia at birth, such as reduced activity, respiratory distress, poor skin color and poor peripheral perfusion; the enlarged liver was palpable 2 - 3 cm below the right costal margin and 5 cm below the xiphoid in one; congestive rashes over the body and muscular hypotonia. Abnormal results of laboratory tests included peripheral blood white cell count (21.6 - 33.8 x 10(9))/L, total neutrophil count 0.77 - 0.83; platelet count (102 - 59 x 10(9))/L; C-reactive protein (CRP) > (160 - 118) mg/L(24 - 72 h after birth). Three preterm infants who received intensive care, accompanied by pathological changes of lungs indicated by chest X ray required assisted mechanical ventilation and 2 of them survived without sequelae but the other one died at 51 h of life. The initial clinical signs of septicemia in 3 full-term infants appeared later than preterm newborn within 62 h, 63 h and 165 h, respectively after birth. They only had fever, T 38 - 39 degrees C, with lower activity in contrast to normal newborn and without other signs and symptoms of septicemia. Accurate diagnosis of listeriosis was established by positive bacterial blood cultures. Intravenous treatment of neonatal listeriosis with ampicillin or penicillins for 1 - 2 weeks was more effective, but cephalosporins were not effective.

CONCLUSIONSThere are sporadic cases with Listeria monocytogenes infection among pregnant women in this country, resulting in severe illness of their newborn infants. Early differential diagnosis, early detection of causative organisms, especially in newborn infants infected with Listeria monocytogenes, early treatment with sensitive antibiotics can decrease the mortality rate and improve neonatal outcome. It is necessary to enhance nationwide surveillance for listeriosis.

Female ; Humans ; Infant ; Infant, Newborn ; Infant, Newborn, Diseases ; diagnosis ; microbiology ; Listeria monocytogenes ; isolation & purification ; Listeriosis ; microbiology ; Male ; Sepsis ; diagnosis ; microbiology

Listeriosis in a healthy child is extremely rare. A previously healthy 9-year-old male was admitted with pyrexia, headache and lethargy. The CSF cultures, taken on admission and on the 5th day, showed growth of Listeria monocytogenes. L. monocytogenes was identified by various methods, including polymerase chain reaction(PCR). Serologically, it showed type 1/2a. However, blood cultures, which were taken on the same days, revealed no growth of L. monocytogenes. Ceftriaxone and amikacin had no effect on the progress of the disease. The combination of ampicillin plus gentamicin, which is regarded as the treatment of choice for L. monocytogenes infection, had an effect in this case. Patient showed severe neurological symptoms and signs, such as diplopia, esotropia, nystagmus, ptosis and other meningeal signs during the hospital days, even though all such symptoms and signs were improved at discharge. We report the case with brief review of related literatures.
Amikacin ; Ampicillin ; Ceftriaxone ; Child* ; Diplopia ; Esotropia ; Fever ; Gentamicins ; Headache ; Humans ; Lethargy ; Listeria monocytogenes ; Listeria* ; Listeriosis ; Male ; Meningitis, Listeria*