Publications by authors named "Danis K"

Background: COVID-19 vaccines have proven effective against severe outcomes in many settings, yet vaccine effectiveness (VE) estimates remain lacking for Kosovo. We aimed to estimate VE against COVID-19 infections, hospitalisations, and deaths for one and two vaccine doses during the fourth pandemic wave in July-September 2021, the period when vaccination initially became widely available.

Methods: We analysed routine surveillance data to define cases and vaccination status as partially (one dose) or completely (two doses) vaccinated.

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Background: There is a lack of empirical data on design effects (DEFF) for mortality rate for highly clustered data such as with Ebola virus disease (EVD), along with a lack of documentation of methodological limitations and operational utility of mortality estimated from cluster-sampled studies when the DEFF is high.

Objectives: The objectives of this paper are to report EVD mortality rate and DEFF estimates, and discuss the methodological limitations of cluster surveys when data are highly clustered such as during an EVD outbreak.

Methods: We analysed the outputs of two independent population-based surveys conducted at the end of the 2014-2016 EVD outbreak in Bo District, Sierra Leone, in urban and rural areas.

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Importance: An association between pneumococcal nasopharyngeal carriage and invasive pneumococcal disease (IPD) has been previously established. However, it is unclear whether the decrease in IPD incidence observed after implementation of nonpharmaceutical interventions (NPIs) during the COVID-19 pandemic was associated with concomitant changes in pneumococcal carriage and respiratory viral infections.

Objective: To assess changes in IPD incidence after the implementation of NPIs during the COVID-19 pandemic and examine their temporal association with changes in pneumococcal carriage rate and respiratory viral infections (specifically respiratory syncytial virus [RSV] and influenza cases) among children in France.

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Background: Pneumococcal conjugate vaccines covering 10 (PCV10) and 13 (PCV13) serotypes have been introduced in the infant immunization schedule of most European countries in 2010-11. To provide additional real-life data, we measured the effectiveness of PCV10 and PCV13 against invasive pneumococcal disease (IPD) in children of 12 European sites (SpIDnet).

Methods: We compared the vaccination status of PCV10 and PCV13 serotype IPD (cases) to that of nonPCV13 serotype IPD (controls) reported in 2012-2018.

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We evaluated invasive pneumococcal disease (IPD) during 8 years of infant pneumococcal conjugate vaccine (PCV) programs using 10-valent (PCV10) and 13-valent (PCV13) vaccines in 10 countries in Europe. IPD incidence declined during 2011-2014 but increased during 2015-2018 in all age groups. From the 7-valent PCV period to 2018, IPD incidence declined by 42% in children <5 years of age, 32% in persons 5-64 years of age, and 7% in persons >65 years of age; non-PCV13 serotype incidence increased by 111%, 63%, and 84%, respectively, for these groups.

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Article Synopsis
  • In France, HPV vaccination is recommended for men who have sex with men (MSM) up to age 26, but a 2019 survey found only 15% of MSM aged 18-28 reported receiving the vaccine.
  • Higher vaccine uptake was associated with younger MSM, lower education levels, living in rural areas, attending sex parties, using HIV prevention methods, and having a history of STIs or receiving other vaccinations like Hepatitis A or B.
  • The study concludes that while HPV vaccination rates are low among MSM in France, those already engaged in other preventive health measures have higher rates, indicating the need for improved outreach and education on HPV vaccination.
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Introduction: COVID-19 pandemic and associated lockdown measures have deeply modified the natural course of seasonal viral infections, such as respiratory syncytial virus (RSV).

Methods: We analyzed French national data from three networks: emergency departments (ED) of French hospitals, general practitioners (GP), and hospital laboratories. We compared the number of ED or GP visits for bronchiolitis in children <2 years of age, and the percentage of RSV positive tests in the 2020 to 2021 season with those of the two previous seasons (2018-2019 and 2019-2020).

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Article Synopsis
  • The study aimed to investigate factors linked to 30-day mortality in young patients hospitalized with invasive pneumococcal disease (IPD) in France between 2013 and 2015.
  • Analysis of data from two major cohort studies identified that older age, a history of malignant tumors, and meningitis were significant risk factors for increased mortality.
  • The findings underscore the importance of targeted vaccination strategies for high-risk patients, particularly given that many high-mortality serotypes are included in established vaccines.
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Article Synopsis
  • The PSERENADE project focuses on global surveillance of invasive pneumococcal disease (IPD) to assess the impact of pneumococcal conjugate vaccines (PCV10/13).
  • Among 138 countries using PCV10/13 as of 2018, 109 had IPD surveillance systems, with data collected from 76, enabling a comprehensive analysis of 240,639 post-vaccine IPD cases.
  • The dataset will aid in understanding the effectiveness of the vaccines across different demographics and vaccination schedules, influencing future immunization policies globally and nationally.
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Article Synopsis
  • Respiratory syncytial virus (RSV) is a leading cause of serious lower respiratory infections in young children and older adults, resulting in numerous hospitalizations and deaths, particularly in infants under 6 months.
  • The lack of current RSV surveillance recommendations in the EU prompted a workshop among experts to establish a comprehensive national surveillance strategy aimed at improving data harmonization and comparison across Europe.
  • The proposed surveillance strategy includes active community and hospital surveillance, passive laboratory monitoring, and the use of standardized PCR methods for RSV detection and genetic tracking, ultimately enhancing the understanding of RSV burden and guiding future vaccination efforts.
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Objectives: The Coronavirus 2019 (COVID-19) pandemic caused a considerable mortality in long-term care facilities (LTCFs), including residential care setting and nursing homes. This study aimed to estimate COVID-19 incidence and mortality in residential care facilities and to compare them with those recorded in nursing homes.

Design: Nationwide observational study conducted by French health authorities.

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Article Synopsis
  • Serotype 1 (ST1) was a major cause of invasive pneumococcal disease (IPD) before the introduction of pneumococcal conjugate vaccines (PCVs), which include ST1 antigen.
  • The PSERENADE project analyzed global data on ST1 IPD to assess the impact of PCV10/13 on disease rates, using advanced statistical methods.
  • Results showed that after six years of using PCV10/13, there was a 95% reduction in ST1 IPD incidence across all age groups, but there is a need for more data from countries heavily affected by ST1 to improve the findings' applicability.
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Article Synopsis
  • The study examined the long-term effects of pneumococcal conjugate vaccines (PCVs) on invasive pneumococcal disease in France from 2001 to 2017, noting the concern over serotype replacement.
  • PCV13 implementation in 2010 led to a significant reduction in disease incidence, but this trend reversed in 2015, with increasing rates observed particularly in children under 2 and adults over 65 by 2017.
  • The analysis highlighted a rebound in disease incidence due to non-PCV13 serotypes, emphasizing the complex dynamics of vaccine impact on public health.
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Background: Kawasaki disease is an acute febrile systemic childhood vasculitis, which is suspected to be triggered by respiratory viral infections. We aimed to examine whether the ongoing COVID-19 epidemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is associated with an increase in the incidence of Kawasaki disease.

Methods: We did a quasi-experimental interrupted time series analysis over the past 15 years in a tertiary paediatric centre in the Paris region, a French epicentre of the COVID-19 outbreak.

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Background: Ebola virus disease case definition is a crucial surveillance tool to detect suspected cases for referral and as a screening tool for clinicians to support admission and laboratory testing decisions at Ebola health facilities. We aimed to assess the performance of the WHO Ebola virus disease case definitions and other screening scores.

Methods: In this systematic review and meta-analysis, we searched PubMed, Scopus, Embase, and Web of Science for studies published in English between June 13, 1978, and Jan 14, 2020.

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Article Synopsis
  • - Residents in long-term care facilities (LTCF) are particularly vulnerable to COVID-19, accounting for 30-60% of all related deaths in several European countries.
  • - Countries need to implement comprehensive testing and infection control measures specifically designed for LTCFs to effectively manage and prevent COVID-19 outbreaks.
  • - Early identification of infection clusters within LTCFs is crucial for minimizing spread and mitigating the severity of outbreaks.
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Objectives: We aimed to estimate vaccine effectiveness against severe measles based on the number of vaccine doses administered and the time since last vaccination.

Patients And Methods: We included measles cases aged at least 2 years and born since 1980 who were notified in France between 2006 and mid-2019. We considered two severity levels (moderate, severe) and calculated adjusted relative risks (aRR) using multinomial logistic regression.

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Background: On 7 February 2020, French Health authorities were informed of a confirmed case of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in an Englishman infected in Singapore who had recently stayed in a chalet in the French Alps. We conducted an investigation to identify secondary cases and interrupt transmission.

Methods: We defined as a confirmed case a person linked to the chalet with a positive reverse-transcription polymerase chain reaction sample for SARS-CoV-2.

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We report the third outbreak of pneumococcal pneumonia within one year among workers in European shipyards. During January and February 2020, 37 cases of pneumonia were identified in a shipyard in Marseille, south-eastern France. Outbreak control measures were implemented, including a mass vaccination campaign with 23-valent pneumococcal polysaccharide vaccine targeting all shipyard workers.

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Background: In France, pneumococcal vaccination in adults is recommended for risk groups (chronic conditions/immunosuppression). We conducted a study on invasive pneumococcal disease (IPD) in adults to identify factors associated with disease severity and death.

Methods: We included IPD cases, excluding meningitis, from 25 acute care hospitals in 6 regions.

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Tropifexor (LJN452) is a potent, orally available, non-bile acid farnesoid X receptor agonist under clinical development for chronic liver diseases. Here, we present results from a first-in-human study of tropifexor following single- and multiple-ascending doses (SAD/MAD) and food effect substudy in healthy volunteers. The SAD study included 6 fasted cohorts receiving 10- to 3000-µg tropifexor or placebo and 1 cohort receiving 300-µg tropifexor with a high-fat meal.

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Sierra Leone has the world's highest estimated maternal mortality. Following the 2014-16 Ebola outbreak, we described health outcomes and health-seeking behaviour amongst pregnant women to inform health policy. In October 2016-January 2017, we conducted a sequential mixed-methods study in urban and rural areas of Tonkolili District comprising: household survey targeting women who had given birth since onset of the Ebola outbreak; structured interviews at rural sites investigating maternal deaths and reporting; and in-depth interviews (IDIs) targeting mothers, community leaders and health workers.

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In 2016, we reviewed preventive control measures for secondary transmission of Shiga-toxin producing Escherichia coli (STEC) in humans in European Union (EU)/European Free Trade Association (EEA) countries to inform the revision of the respective Norwegian guidelines which at that time did not accommodate for the varying pathogenic potential of STEC. We interviewed public health experts from EU/EEA institutes, using a semi-structured questionnaire. We revised the Norwegian guidelines using a risk-based approach informed by the new scientific evidence on risk factors for HUS and the survey results.

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Registered dietitian nutritionists at University of Pittsburgh Medical Center, a group of 40 academic, community, and specialty hospitals in Pittsburgh, PA, recognized the need to improve the identification and management of malnourished adult patients at their institutions. It was decided to pilot the Malnutrition Quality Improvement Initiative (MQii) at two institutions within their health care system. The MQii is based on the dual-pronged approach of malnutrition-focused electronic clinical quality measures and a quality improvement toolkit (MQii Toolkit), to help identify and manage malnourished adult patients.

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