Challenges in synthesis of real-world vaccine effects on meningococcal serogroup B disease for 4CMenB vaccine post-licensure effectiveness studies: A systematic review.

BACKGROUND: Real-world studies on vaccine effects are diverse in terms of objectives, study setting and design, data type and scope, and analysis methods. In this review, we describe and discuss four-component meningococcal serogroup B vaccine (4CMenB vaccine, Bexsero) real-world studies with the aim of synthesizing their findings with application of standard methods. METHODS: We performed a systematic literature review of all real-world studies on 4CMenB vaccine effects on meningococcal serogroup B disease, with no restriction for population age, vaccination schedule and/or type of vaccine effect evaluated (vaccine effectiveness [VE] and vaccine impact [VI] outcomes) published since its licensure in 2013 (from January 2014 until July 2021) in PubMed, Cochrane and the grey literature. We then aimed to synthesize the findings of the identified studies through application of standard synthesis methods. RESULTS: According to reported criteria we retrieved five studies presenting estimates on 4CMenB vaccine effectiveness and impact. These studies showed great diversity in population, vaccination schedule and analysis methods mainly due to diversity in vaccine strategies and recommendations in the study settings. Directed by this diversity, no quantitative pooling methods to synthesize findings could be applied; instead we descriptively assessed study methods. We report VE estimates ranging from 59% to 94% and VI estimates ranging from 31% to 75%, representing diverse age groups, vaccination schedules and analysis methods. CONCLUSION: Both vaccine outcomes showed real-life effectiveness of 4CMenB vaccine despite differences in study methodologies and vaccination strategies. Based on appraisal of study methods, we highlighted the need for an adapted tool which facilitates synthesis of heterogenic real-world vaccine studies when quantitative pooling methods are not applicable.

Rates and Predictors of Treatment Failure in Staphylococcus aureus Prosthetic Joint Infections According to Different Management Strategies: A Multinational Cohort Study-The ARTHR-IS Study Group.

INTRODUCTION: Guidelines have improved the management of prosthetic joint infections (PJI). However, it is necessary to reassess the incidence and risk factors for treatment failure (TF) of Staphylococcus aureus PJI (SA-PJI) including functional loss, which has so far been neglected as an outcome. METHODS: A retrospective cohort study of SA-PJI was performed in 19 European hospitals between 2014 and 2016. The outcome variable was TF, including related mortality, clinical failure and functional loss both after the initial surgical procedure and after all procedures at 18 months. Predictors of TF were identified by logistic regression. Landmark analysis was used to avoid immortal time bias with rifampicin when debridement, antibiotics and implant retention (DAIR) was performed. RESULTS: One hundred twenty cases of SA-PJI were included. TF rates after the first and all surgical procedures performed were 32.8% and 24.2%, respectively. After all procedures, functional loss was 6.0% for DAIR and 17.2% for prosthesis removal. Variables independently associated with TF for the first procedure were Charlson ≥ 2, haemoglobin < 10 g/dL, bacteraemia, polymicrobial infection and additional debridement(s). For DAIR, TF was also associated with a body mass index (BMI) > 30 kg/m2 and delay of DAIR, while rifampicin use was protective. For all procedures, the variables associated with TF were haemoglobin < 10 g/dL, hip fracture and additional joint surgery not related to persistent infection. CONCLUSIONS: TF remains common in SA-PJI. Functional loss accounted for a substantial proportion of treatment failures, particularly after prosthesis removal. Use of rifampicin after DAIR was associated with a protective effect. Among the risk factors identified, anaemia and obesity have not frequently been reported in previous studies. TRIAL REGISTRATION: This study is registered at clinicaltrials.gov, registration no. NCT03826108.

Staphylococcus aureus is one of the most virulent bacteria and frequently causes prosthetic joint infections.Knowledge of the treatment of this type of infection has advanced in recent years, and treatment guidelines have led to improved management. Typically, the successful treatment of these infections has been determined by clinical cure, that is, the symptoms of infection have disappeared, but has not taken into account loss of function (such as significant difficulties walking), which is critical for the patient's quality of life. Our aim in this study was to evaluate the success of current management strategies for S. aureus prosthetic joint infection, including recovery of functionality, and the factors that predict why some of these infections are not cured, to identify areas for improvement.In a multinational cohort of 128 patients with S. aureus prosthetic joint infection, rates of treatment failure were found to be high, with significant rates of loss of function, especially when the prosthesis needed to be removed. Loss of function was less frequent when the infection was initially treated with surgical cleaning without removal of the prosthesis, even when this procedure failed at first. We found that anaemia and obesity were associated with lower treatment success, and that the probability of treatment success increased when surgical cleaning without prosthesis removal was performed early, and when the antibiotic rifampicin was used in combination with another antibiotic.

Preoperative and perioperative risk factors, and risk score development for prosthetic joint infection due to Staphylococcus aureus: a multinational matched case-control study.

OBJECTIVES: We aim to identify the preoperative and perioperative risk factors associated with post-surgical Staphylococcus aureus prosthetic joint infections (PJI) and to develop and validate risk-scoring systems, to allow a better identification of high-risk patients for more efficient targeted interventions. METHODS: We performed a multicenter matched case-control study of patients who underwent a primary hip and knee arthroplasty from 2014 to 2016. Two multivariable models by logistic regression were performed, one for the preoperative and one for perioperative variables; predictive scores also were developed and validated in an external cohort. RESULTS: In total, 130 cases and 386 controls were included. The variables independently associated with S. aureus-PJI in the preoperative period were (adjusted OR; 95% CI): body mass index >30 kg/m2 (3.0; 1.9 to 4.8), resident in a long-term care facility (2.8; 1.05 to 7.5), fracture as reason for arthroplasty (2.7; 1.4 to 5.03), skin disorders (2.5; 0.9 to 7.04), previous surgery in the index joint (2.4; 1.3 to 4.4), male sex (1.9; 1.2 to 2.9) and American Society of Anesthesiologists index score 3 to 4 (1.8; 1.2 to 2.9). The area under the receiver operating characteristic curve was 0.73 (95% CI 0.68 to 0.78). In perioperative model, the risk factors were the previous ones plus surgical antibiotic prophylaxis administered out of the first 60 minutes before incision (5.9; 2.1 to 16.2), wound drainage for >72 hours after arthroplasty (4.5; 1.9 to 19.4) and use of metal bearing material versus ceramic (1.9; 1.1 to 3.3). The area under the receiver operating characteristic curve was 0.78 (95% CI 0.72 to 0.83). The predictive scores developed were validated in the external cohort. DISCUSSION: Predictive scores for S. aureus-PJI were developed and validated; this information would be useful for implementation of specific preventive measures.

Safety Profile of GSK's Inactivated Quadrivalent Seasonal Influenza Vaccine in Belgium, Germany and Spain: Passive Enhanced Safety Surveillance Study for the 2019/2020 Influenza Season.

INTRODUCTION: Seasonal influenza infects millions annually in Europe. Annual influenza vaccination is the most effective measure to reduce the risk of infection and its complications, especially among young children and older adults. OBJECTIVE: We assessed adverse event (AE) frequency after receiving GSK's inactivated quadrivalent seasonal influenza vaccine (IIV4). METHODS: A passive enhanced safety surveillance study was conducted in Belgium, Germany, and Spain. Adults who had received GSK's IIV4 or the parent(s)/guardian(s)/legally acceptable representative(s) of children given the vaccine were invited to complete an adverse drug reaction (ADR) card to document AEs experienced within 7 days post vaccination. RESULTS: A total of 1082 participants (51.6% females) received GSK's IIV4, including 115 children < 9 years of age who received two doses. The ADR card return rate was 97.0% (n = 1049) after dose 1 and 100% (n = 115) after dose 2. All participants in Belgium and Germany were adults. In Spain, 71.2% were children. After dose 1, 39.2% reported one or more AE. The most frequent AEs category was "general disorders and administration site conditions" (GDASC). AEs were most frequently reported in adults aged 18-65 years (47.2%), followed by children aged 6 months-17 years (38.1%), and adults aged > 65 years (31.6%). After dose 2, 7.8% reported one or more AE, and GDASC was again the most frequent AE category. There were no serious AEs related to GSK's IIV4 within 7 days post vaccination. CONCLUSION: No serious AEs related to GSK's IIV4 within 7 days post vaccination were reported. This study supports the favourable risk-benefit safety profile of GSK's IIV4.

Seasonal influenza infects millions annually in Europe, especially young children and older adults. Annual influenza vaccination is the most effective measure to reduce the risk of infection and its complications. As the wild influenza virus strains change every year, the composition of the influenza vaccine changes as well. Since the vaccine is produced in the same way over the years, extensive safety studies are no longer required by regulatory authorities. Instead, monitoring of any unwanted medical incidents (adverse events) after vaccination is required. For the 2019/2020 season, we monitored the adverse events reported by a representative sample of people in Belgium, Germany, and Spain within 7 days after receiving GSK's seasonal influenza vaccine.Of the 1082 people who received the first dose of the vaccine, 39% reported at least one adverse event, such as pain and swelling at the injection site, tiredness, fever, headache, or dizziness. A total of 115 children under 9 years of age received two doses 4 weeks apart. After their second dose, few of these children (8%) reported adverse events. The most frequent adverse events were fever, swelling and pain at the injection site, runny nose, or irritability. No serious adverse events were reported after either the first or second dose.No serious adverse events related to GSK's seasonal influenza vaccine within the 7 days after vaccination were reported. This study supports the favourable risk­benefit safety profile of GSK's seasonal influenza vaccine.

Causal inference concepts applied to three observational studies in the context of vaccine development: from theory to practice.

BACKGROUND: Randomized controlled trials are considered the gold standard to evaluate causal associations, whereas assessing causality in observational studies is challenging. METHODS: We applied Hill's Criteria, counterfactual reasoning, and causal diagrams to evaluate a potentially causal relationship between an exposure and outcome in three published observational studies: a) one burden of disease cohort study to determine the association between type 2 diabetes and herpes zoster, b) one post-authorization safety cohort study to assess the effect of AS04-HPV-16/18 vaccine on the risk of autoimmune diseases, and c) one matched case-control study to evaluate the effectiveness of a rotavirus vaccine in preventing hospitalization for rotavirus gastroenteritis. RESULTS: Among the 9 Hill's criteria, 8 (Strength, Consistency, Specificity, Temporality, Plausibility, Coherence, Analogy, Experiment) were considered as met for study c, 3 (Temporality, Plausibility, Coherence) for study a, and 2 (Temporary, Plausibility) for study b. For counterfactual reasoning criteria, exchangeability, the most critical assumption, could not be tested. Using these tools, we concluded that causality was very unlikely in study b, unlikely in study a, and very likely in study c. Directed acyclic graphs provided complementary visual structures that identified confounding bias and helped determine the most accurate design and analysis to assess causality. CONCLUSIONS: Based on our assessment we found causal Hill's criteria and counterfactual thinking valuable in determining some level of certainty about causality in observational studies. Application of causal inference frameworks should be considered in designing and interpreting observational studies.

The real-world evidence of heart failure: findings from 41 413 patients of the ARNO database.

AIMS: Patients with heart failure (HF) randomized in controlled trials are generally selected and do not fully represent the 'real world'. The purpose of this study is to better describe the characteristics of HF by analysing administrative data of a population of nearly 2 500 000 subjects. METHODS AND RESULTS: Data came from the ARNO Observatory including inhabitants of five Local Health Units of the Italian National Health Service (INHS). Patients were selected when discharged for HF (1 January 2008-31 December 2012) and prescribed at least one HF treatment. Clinical characteristics, pharmacological treatments, rehospitalization, and direct costs for the INHS were described during 1-year follow-up (FU). Of the 2 456 739 subjects included in the database, 54 059 (2.2%) were hospitalized for HF: 41 413 were discharged alive and prescribed HF treatments. Mean age was 78 ± 11 years and 51.4% were females. Just 26.6% were managed in a cardiology setting. The most frequent co-morbidities were diabetes (30.7%), COPD (30.5%), and depression (21%). ACE inhibitors/ARBs, beta-blockers, and mineralocorticoid antagonists were prescribed in 65.8, 49.7, and 42.1% of patients, respectively. During 1-year FU, at least one rehospitalization occurred in 56.6% of patients, 49% of them due to non-cardiovascular causes. The direct cost per patient per year to the INHS was €11 867, of which 76% was related to hospitalizations. CONCLUSIONS: Real-world evidence provides a description of patient characteristics and treatment patterns that are different from those reported by randomized clinical trials. Costs for the INHS are mainly driven by hospitalizations, which are often due to non-cardiovascular reasons.

Overt hepatic encephalopathy in Italy: clinical outcomes and healthcare costs.

PURPOSE: Hepatic encephalopathy (HE) is a recurrent severe complication of progressive hepatic cirrhosis. The aim of this study is to evaluate the average annual direct healthcare costs for the treatment of patients with overt HE in Italy. PATIENTS AND METHODS: This retrospective, observational study analyzed information from the database of ARNO Observatory. Patients with at least one hospitalization due to overt HE in the period from January 1, 2011 to December 31, 2011, were selected and observed during the year following the hospitalization. Costs for drugs, diagnostic and therapeutic procedures, and hospitalizations were estimated from the Italian National Health Service perspective. RESULTS: Out of a population of 2,678,462 subjects, 381 patients were identified, of whom, 21.5% died during the first hospitalization and 5.8% during the follow-up; the survival rate was 72.7% at the end of the observation period. The direct healthcare costs per patient amounted to €13,393/year (15,295 USD) (88% for hospitalizations, 8% for drugs, and 4% for diagnostic procedures). During the follow-up, 42.5% of patients had at least one rehospitalization due to HE. Patients readmitted for HE had an average annual cost of €21,272 (24,293 USD), almost doubled if compared to patients without readmissions (€12,098 [13,816 USD]). CONCLUSION: This analysis showed that patients with HE had relevant direct healthcare costs, in which hospitalizations were the most important cost drivers.

Direct healthcare costs and resource consumption after acute coronary syndrome: a real-life analysis of an Italian subpopulation.

BACKGROUND: Acute coronary syndrome (ACS) is the most common cause of morbidity and mortality in Italy and worldwide. Aim of this study was to evaluate the average annual direct healthcare costs for the treatment of patients with a recent hospitalization for ACS. DESIGN AND METHODS: The direct medical costs of patients with a first ACS hospitalization (index event) in the period from 1 January 2008 to 31 December 2008 were estimated for a 1-year follow-up period. The resource consumption was measured in terms of: reimbursed drugs, diagnostic procedures, outpatient visits, and hospitalizations. The analysis was performed from the Italian National Health Service perspective. RESULTS: A total of 2,758,872 subjects were observed, 7082 (35.8% women) of whom being hospitalized for ACS during the accrual period (2.6 ‰). Among patients with ACS, 60% were medically treated, 33.1% were treated with percutaneous coronary intervention (PCI), and 6.9% died during the index hospitalization. Dual antiplatelet treatment (ASA plus clopidogrel) was prescribed in 25.9% of the medically treated ACS patients and in 70.1% of the ACS patients treated with PCI. The average yearly cost per patient for the total ACS population was 11,464€/year (drugs 1,304€; hospitalizations 9,655€; diagnostic and outpatient visits 505€). The average annual cost was 10,862€ for medically treated patients and 14,111€ for patients treated with PCI. Patients who died of cardiovascular events during follow up had an average cost of 16,231€/patient. CONCLUSIONS: Patients with ACS had higher direct healthcare costs, their management and rehospitalizations being the main cost drivers.

Use and misuse of statins after ACS: analysis of a prescription database of a community setting of 2,042,968 subjects.

AIMS: To assess in a community setting how patients discharged alive after an acute coronary syndrome (ACS) are treated with statins. Specifically, the rate of prescription, the dosages, and 1-year adherence have been evaluated. METHODS AND RESULTS: From the ARNO Observatory, we carried out a record linkage analysis of discharge records for ACS and prescription databases, which included 2,042,968 subjects of seven local health authorities from northern to southern Italy. The accrual period lasted from 1 January to 30 June 2007. Logistic regression analysis was performed to identify the independent predictors of prescription continuity. Of the 2,042,968 subjects, 1.5‰ were hospitalised for ACS over the 6 months, 58% of patients were aged more than 70 years, and females accounted for 33% of the cases. In-hospital all-cause death was 7.4%. Of the patients discharged alive, 80.7% received a statin treatment. High dosage of statins were used only in a minority of cases. After 1-year follow up, adherence to treatment was observed in 67.2% of patients. Older age and the presence of comorbidities were independently associated with a better prescription continuity, while presence of cancer or depression was associated with a poor prescription continuity. CONCLUSION: In a community setting, the rate of prescription of statins seems to be satisfactory. However, the dosages of statins suggest that the recommendation to use intensive statin treatment seems to be not adequately followed. Further, prescription continuity over time was suboptimal. There is still a relevant gap between evidence-based recommendations and what actually happens in routine clinical practice.

Outcomes, health costs and use of antiplatelet agents in 7,082 patients admitted for an acute coronary syndrome occurring in a large community setting.

PURPOSE: To assess the outcomes of patients admitted for ACS and the prescription pattern of antiplatelets of patients discharged alive. METHODS: From the ARNO Observatory database, we performed a record linkage analysis of hospital discharge and prescription databases, which included 2,758,872 subjects of 7 Italian Local Health Authorities. The accrual period lasted from January 1 to December 31, 2008. Discharge records and prescription patterns were analyzed for 1 year before and after the accrual period. RESULTS: Of 2,758,872 subjects, 7,082 (2.6‰) were hospitalized for ACS. Mean age was 72±13 years, females and diabetics accounted for 36% and 25% of the cases. Of the 7,082 patients, in-hospital death occurred in 6.9%. Of the survivors, 64.5% was treated medically, 35.5% with PCI. Of the patients discharged alive, 65.8% were treated with an antiplatelet, 21.9% aspirin alone, 33.1% aspirin plus a thienopyridine (mostly clopidogrel), 10.5% a thienopyridine alone. Dual antiplatelet treatment was prescribed more frequently in patients treated with PCI than in those treated medically (57.3% vs 19.7%, p<0.0001). At least one re-hospitalization occurred in 58.6% (18.5% for a recurrent episode of ACS, 24.8% for other CV reasons, 15.3% for non CV reasons). Prescription continuity to antiplatelets was observed in 68.0% and 60.3% of the patients, respectively at 6 and 12 months after discharge. CONCLUSION: In a large community setting, the prescription rate of antiplatelets after ACS seems to be far from the guidelines recommendation. Rates of 1 year re-hospitalizations after ACS remain high, recurrence of ACS accounted for just one third of the cases.