Publications by authors named "Greeff A"

() is a major porcine pathogen. Some strains have a substantial zoonotic potential such as serotype () 14 as the second most important in human infections. To this date no licensed vaccine is available in Europe though subunit vaccines and bacterins have been examined by several scientific groups worldwide.

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Streptococcus suis, a common member of the porcine respiratory microbiota, can cause life-threatening diseases in pigs as well as humans. A previous study identified the gene trpX as conditionally essential for in vivo survival by intrathecal infection of pigs with a transposon library of S. suis strain 10.

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The aim of this study was to explore experiences of homelessness in an affluent university town. Seven homeless men were recruited at a welfare program for homeless people to participate in in-depth, semistructured interviews that explored their experiences of homelessness in the town. The ages of the participants ranged from 36 to 52 years.

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Introduction: Due to the increase of antibiotic resistant bacterial strains, there is an urgent need for development of alternatives to antibiotics. Cathelicidins can be such an alternative to antibiotics having both a direct antimicrobial capacity as well as an immunomodulatory function. Previously, the full d-enantiomer of chicken cathelicidin-2 (d-CATH-2) has shown to prophylactically protect chickens against infection 7 days post hatch when administered three days before hatch.

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Streptococcus suis, an emerging zoonotic pathogen, causes invasive diseases in pigs, including sepsis, meningitis, endocarditis, pneumonia, and arthritis. Importantly, similar pathologies are reported in human S. suis infections.

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Streptococcus suis serotype (cps) 1 and cps14 have been detected in association with severe diseases such as meningitis and polyarthritis in pigs. Though these two cps are very similar, only cps14 is an important zoonotic agent in Asia and only cps1 is described to be associated with diseases in suckling piglets rather than weaning piglets. The main objective of this study was to assess restriction of survival of cps14 and cps1 in porcine blood by IgG and IgM putatively cross-reacting with these two cps.

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The objective of this study is to investigate the effect of a maternal antibiotic administration during the last week of gestation on the early life intestinal development in neonatal piglets. Colonization of the gut with bacteria starts during birth and plays a major role in the intestinal and immunological development of the intestine. We demonstrate that maternal interventions induced changes in the sows (n = 6 to 8 per treatment) fecal microbiota diversity around birth (P < 0.

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is a swine pathogen and a zoonotic agent afflicting people in close contact with infected pigs or pork meat. Sporadic cases of human infections have been reported worldwide. In addition, outbreaks emerged in Asia, making this bacterium a primary health concern in this part of the globe.

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Article Synopsis
  • - The study focuses on a Gram-positive bacterium that can cause serious infections like meningitis and sepsis in both pigs and humans, aiming to identify key genes necessary for its infection.
  • - Researchers created special genetic libraries from a virulent strain and analyzed mutants recovered from infected sites in pigs, identifying 361 essential genes that are crucial for the bacterium’s ability to infect, which represent about 18% of its total genome.
  • - Further experiments with a selection of genetic mutants demonstrated varying sensitivities to environmental stressors, and the findings could help develop new vaccines or antimicrobial treatments against this pathogen.
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The aim of this study was to explore factors that helped adolescents to adjust and continue with life after the death of a parent. A qualitative research design was utilized, in which 12 participants participated in semistructured interviews. Data were analyzed according to thematic analysis.

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Objective: To assess the static device accuracy of the Spacelabs 90227 OnTrak according to the three most recognized validation protocols, in both adults and children.

Methods: Subjects were recruited and data gathered and analysed according to the European Society of Hypertension (ESH-IP2), the British Hypertension Society (BHS) and the American National Standards Institute/Association for the Advancement of Medical Instrumentation/International Standards Organization (ANSI/AAMI/ISO) protocols.

Results: The device achieved a mean difference ± SD between observers and device for SBP/DBP was 0.

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Streptococcus suis is a porcine pathogen, causing severe invasive infections. S. suis serotype 9 is increasingly causing disease in Dutch and Chinese pig herds, but it is unknown whether all serotype 9 isolates are equally virulent and markers that can identify virulent strains are not available.

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Preeclampsia is a common cause of acute kidney injury (AKI) in low- and middle-income countries, but AKI incidence in preeclampsia, its risk factors, and renal outcomes are unknown. A prospective observational multicenter study of women admitted with preeclampsia in South Africa was conducted. Creatinine concentrations were extracted from national laboratory databases for women with maximum creatinine of ≥90 μmol/L (≥1.

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Introduction: Shock index (SI) is a predictor of hemodynamic compromise in obstetric patients. The SI threshold for action is not well understood. We aimed to evaluate SI thresholds as predictors of outcomes in obstetric patients.

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Streptococcus suis is a Gram-positive bacterium and a zoonotic pathogen residing in the nasopharynx or the gastrointestinal tract of pigs with a potential of causing life-threatening invasive disease. It is endemic in the porcine production industry worldwide, and it is also an emerging human pathogen. After invasion, the pathogen adapts to cause bacteremia and disseminates to different organs including the brain.

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Streptococcus suis is an economically important pathogen of pigs as well as a zoonotic cause of human disease. Serotyping is used for further characterization of isolates; some serotypes seem to be more virulent and more widely spread than others. This study characterizes a collection of German field isolates of Streptococcus suis from pigs dating from 1996 to 2016 with respect to capsular genes (cps) specific for individual serotypes and pathotype by multiplex PCR and relates results to the clinical background of these isolates.

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Objectives: Haemorrhage, hypertension, sepsis and abortion complications (often from haemorrhage or sepsis) contribute to 60% of all maternal deaths. Each is associated with vital signs (blood pressure (BP) and pulse) abnormalities, and the majority of deaths are preventable through simple and timely intervention. This paper presents the development and evaluation of the CRADLE Vital Signs Alert (VSA), an accurate, low-cost and easy-to-use device measuring BP and pulse with an integrated traffic light early warning system.

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Article Synopsis
  • Hypertensive disorders during pregnancy account for 14% of maternal deaths, notably in low- and middle-income countries, prompting this study to analyze outcomes for women with pre-eclampsia in South Africa.
  • Results from a study of 1547 women revealed that 1% died, with significant rates of eclampsia (9.5%), kidney injury (17.6%), and high perinatal death (21%), primarily due to stillbirths.
  • Key predictors of severe outcomes included young maternal age and low BMI for eclampsia, high blood pressure for kidney problems, and early admission for perinatal death, indicating a need for targeted interventions.
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In this work, a spore-based biosensor is evaluated to monitor the microbicidal efficacy of sterilization processes applying gaseous hydrogen peroxide (HO). The sensor is based on interdigitated electrode structures (IDEs) that have been fabricated by means of thin-film technologies. Impedimetric measurements are applied to study the effect of sterilization process on spores of Bacillus atrophaeus.

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Background: Vital signs measurement can identify pregnant and postpartum women who require urgent treatment or referral. In low-resource settings, healthcare workers have limited access to accurate vital signs measuring devices suitable for their environment and training. The CRADLE Vital Signs Alert (VSA) is a novel device measuring blood pressure and pulse that is accurate in pregnancy and designed for low-resource settings.

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Objectives: To evaluate the association between blood pressure (BP) measurements and adverse outcomes in women with pre-eclampsia.

Study Design: A prospective cohort study of women with pre-eclampsia admitted to three South African tertiary facilities. BP was measured using the CRADLE Vital Signs Alert (VSA), incorporated with a traffic light early warning system; green: systolic BP <140 mmHg and diastolic BP <90 mmHg, yellow: systolic BP 140-159 and/or diastolic BP 90-109 mmHg (but neither is above the upper threshold), red: systolic BP ≥160 mmHg and/or diastolic BP ≥110 mmHg.

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Invasive Streptococcus suis (S. suis) infections in pigs are often associated with serotypes 2 and 9. Mucosal sites of healthy pigs can be colonized with these serotypes, often multiple serotypes per pig.

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Using a novel porcine model of intravenous Streptococcus pneumoniae infection, we showed that invasive pneumococcal infections induce marked platelet activation and hyperreactivity. This may contribute to the vascular complications seen in pneumococcal infection.

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Background: Streptococcus pneumoniae, a Gram-positive bacterium carried in the human nasopharynx, is an important human pathogen causing mild diseases such as otitis media and sinusitis as well as severe diseases including pneumonia, meningitis and sepsis. There is a strong resemblance between the anatomy, immunology and physiology of the pig and human species. Furthermore, there are striking similarities between S.

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