Publications by authors named "Tazi A"

The Société de Pathologie Infectieuse de Langue Française released in 2024 a new national recommendation for clinical practice on the prevention and management of varicella zoster virus (VZV) infection during pregnancy and the perinatal period. The previous recommendation was issued in 1998, at a time of anti-VZV immunoglobulins shortage; it has hence become obsolete. This recommendation is a formalized expert consensus focusing on infectious diseases management; it is drawn up by a multidisciplinary working group (infectiologists, obstetricians, pediatricians, microbiologists, midwives, hygienists).

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Bacterial two-component systems (TCSs) are signaling modules that control physiology, adaptation, and host interactions. A typical TCS consists of a histidine kinase (HK) that activates a response regulator via phosphorylation in response to environmental signals. Here, we systematically test the effect of inactivating the conserved phosphatase activity of HKs to activate TCS signaling pathways.

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Background: During the first pandemic of COVID-19, early empirical antibiotic use rates for pneumonia varied widely. The benefit remains hypothetical.

Methods: We assessed the benefit of empirical antibiotic use at admission in patients hospitalized with COVID-19 pneumonia.

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Background: Antipsychotic medications are the primary treatment for schizophrenia, with olanzapine being an effective medication for schizophrenia. The economic cost for each individual with schizophrenia is high, with antipsychotic medication being a major expense. This study aims to develop an economic decision model that compares different treatment options for schizophrenia patients, including olanzapine Orally Dispersible Tablets (ODT), olanzapine [ODT + Standard Oral Tablet (SOT)], risperidone (ODT + SOT), and aripiprazole (ODT + SOT), to determine their cost-effectiveness with an objective to optimize healthcare resource allocation in Morocco.

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Research on lemon grass ( L.) revealed a variety of active molecules and examined their biological characteristics. However, most of these studies were conducted on wild varieties, while cultivated plants were addressed less.

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  • Two clinical isolates of Klebsiella michiganensis from the same patient were genetically compared, revealing differing resistance profiles: one was resistant to piperacillin-tazobactam and intermediate to cefotaxime, while the other was resistant to ceftazidime but susceptible to piperacillin-tazobactam.
  • * A mutation in the bla gene, resulting in a L169M change in the Ω loop, was identified as a key factor in the resistance differences.
  • * Cloning experiments in E. coli demonstrated that this mutation allowed for increased resistance to ceftazidime and cefepime but reduced resistance to piperacillin-tazobactam, marking a novel discovery of how
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  • Group B Streptococcus (GBS), particularly the hypervirulent CC17 clone, is a major cause of neonatal meningitis linked to significant mortality and disability.
  • This study examined how GBS CC17 interacts with the choroid plexus, a critical part of the blood-cerebrospinal fluid barrier, using both mouse models and in vitro cell studies.
  • Results showed that GBS CC17 effectively invades choroid plexus cells through a specific mechanism, leading to immune responses and potential pathways for brain infections.
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is among the few pathogens that have not developed resistance to ß-lactam antibiotics despite decades of clinical use. The molecular basis of this long-lasting susceptibility has not been investigated, and it is not known whether specific mechanisms constrain the emergence of resistance. In this study, we first report ß-lactam tolerance due to the inactivation of the c-di-AMP phosphodiesterase GdpP.

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  • A study on Group B Streptococcus (GBS) neonatal infections in France from 2007 to 2021 found that out of 1,527 cases, 36 (2.36%) were recurrent infections.
  • Recurrence was more common in preterm (68%) and low birthweight (72%) infants, with a significant association to the hypervirulent GBS clonal complex 17.
  • No tolerant strains were found, and genome sequencing didn't identify specific recurrence traits, highlighting the need for larger studies on managing these rare cases.
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Background: Erdheim-Chester disease (ECD) is a rare histiocytosis that may overlap with Langerhans Cell Histiocytosis (LCH). This "mixed" entity is poorly characterized. We here investigated the clinical phenotype, outcome, and prognostic factors of a large cohort of patients with mixed ECD-LCH.

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  • Group B Streptococcus (GBS) is a major cause of severe infections in newborns, and preventing these infections involves giving antibiotics to GBS-colonized pregnant women during labor.
  • The study evaluated the effectiveness of two rapid tests, Ampliflash® GBS and PlusLife® GBS, for detecting GBS in vaginal samples, comparing them with traditional culture methods.
  • Results showed that both tests were highly sensitive and specific, providing quick results within 10 to 35 minutes, indicating they could be more efficient in preventing GBS-related neonatal diseases than current screening methods, but further research is necessary.
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  • Systematic cultures of central line tips in NICUs may not be as clinically useful due to high bacterial contamination rates during removal, leading to debate on their necessity.
  • A retrospective study analyzed infections and bacterial colonization in 375 newborns with central catheters, finding a 43% colonization rate and 31 confirmed catheter-related infections among suspected sepsis cases.
  • The study suggests that only culturing catheters when infections are suspected could be a more efficient approach than routine screening, as antibiotic effectiveness did not significantly differ between expert recommendations and actual prescriptions.
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  • Group B Streptococcus (GBS), particularly the capsular serotype III called CC17, is a major cause of serious infections like bacteremia and meningitis in newborns, being labeled as a hypervirulent clone.
  • The study found that CC17 strains are engulfed (phagocytosed) more effectively by human monocytes and macrophages compared to non-CC17 strains, due to enhanced attachment facilitated by specific proteins (HvgA and PI-2b pilus).
  • Despite being phagocytosed more efficiently, both CC17 and non-CC17 strains survive similarly within immune cells, suggesting that CC17's enhanced phagocytosis might help it evade the immune system and persist in the
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Pathology and biology are essential in the patient care. However, they suffer from a lack of attractiveness to medicine students. In order to gain insight and improve the visibility and attractiveness of these specialties, we designed a survey and submitted forms to medical students, laboratory medical staff, and clinical staff from the different hospitals and institutes attached to "Université Paris Cité".

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Aim: Clusters of group B Streptococcus (GBS) infections in neonatal intensive care units (NICU) are poorly documented. We aimed to assess GBS cross-transmission during an outbreak of GBS sepsis.

Methods: The study was carried out between October and November 2021 in a French University Hospital.

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  • Pulmonary Langerhans cell histiocytosis (PLCH) is a rare interstitial lung disease primarily associated with smoking, diagnosed through a surgical lung biopsy and differentiation from other ILDs.
  • A study analyzed bronchoalveolar lavage (BAL) samples from 36 ILD patients to identify unique cytokine and chemokine profiles that could help distinguish PLCH from other smoking-related ILDs and idiopathic pulmonary fibrosis (IPF).
  • Significant differences in 32 cytokines/chemokines were observed, with PCA showing distinct clustering of patients, and a random forest model successfully differentiated PLCH from other ILDs based on immune profiles.
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Bronchoalveolar lavage fluid (BALF) is a standard respiratory sample for diagnosing invasive fungal diseases like Pneumocystis pneumonia (PCP) and invasive pulmonary aspergillosis (IPA). However, procedural variations exist across medical centers and wards. This study aimed to compare the diagnostic potential of BALF and bronchial aspirate (BA) obtained during bronchoscopy in 173 patients suspected of fungal infections.

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