Economic burden and health-related quality-of-life among infants with respiratory syncytial virus infection: A multi-country prospective cohort study in Europe

Estimated impact of nirsevimab prophylaxis on the economic burden of respiratory syncytial virus disease in Northern Italy

BACKGROUND

Respiratory syncytial virus (RSV) is a frequent cause of acute lower respiratory tract infection (LRTI) in infants; however, the health and economic burden of infant RSV-associated LRTI in Northern Italy has not been sufficiently assessed. We evaluated the clinical and economic burden of RSV-associated LRTI requiring emergency department (ED) access and/or hospitalization in infants less than 6 months old in two provinces in Northern Italy and estimated the potential impact of universal immunization with a recently approved monoclonal antibody.

METHODS

Epidemiological data during the 2021-2022 and 2022-2023 RSV seasons were obtained from administrative records and anonymized to comply with confidentiality requirements. Resource utilization was estimated using the costs associated with each event, obtained from the available literature and an analysis of national hospital discharge records. A static decision analytic model was used to estimate RSV-related health and associated cost outcomes.

RESULTS

Overall, 882 ED accesses and 430 hospital admissions associated with RSV were recorded during two consecutive epidemic seasons. Intensive care admission was needed in 85 cases. Universal immunization would avoid 406 ED accesses and 199 hospital admissions. The total economic burden was estimated at over €1.5 million, of which 51% was for hospitalization, 20% for intensive care, and 9% for ED access. An additional 10% was estimated for the management of long-term consequences of RSV-associated LRTI. Universal immunization would avoid expenses of €124,092 for ED accesses and €999,629 for hospital admissions.

CONCLUSIONS

These findings underscore the substantial health and economic burden of RSV disease, highlighting the potential benefits of universal prevention strategies, while informing policymaker decisions regarding implementation of immunoprophylaxis.

Cost-Effectiveness Analysis of Nirsevimab for the Prevention of Respiratory Syncytial Virus among Italian Infants

BACKGROUND AND OBJECTIVE

Respiratory syncytial virus (RSV) is a major global cause of childhood respiratory infections, globally linked to significant morbidity and mortality, particularly leading in hospitalizations and death among infants below 1 year of age. A cost-effectiveness analysis was conducted to estimate the economically justifiable price (EJP) of nirsevimab, a new prophylaxis strategy protecting all infants against RSV lower respiratory tract infections (LRTIs), compared with a strategy consisting of palivizumab, protecting only high-risk infants and no preventive intervention for others.

METHODS

A static decision tree model previously published to evaluate the clinical and economic burden of RSV in Italy was used to determine the EJP of nirsevimab for the prevention of RSV medically attended lower respiratory tract infections (RSV-MA-LRTIs) in all infants experiencing their first RSV season, to become a cost-effective alternative compared with palivizumab only in high-risk infants and no preventive intervention for others. The EJP was estimated considering three different willingness-to-pay (WTP) thresholds. The National Health Service (NHS) perspective was considered in the base-case. Direct costs considered in the analysis were acquisition and administration costs of prophylaxis, costs of managing RSV infection (inpatient and outpatient care, and emergency department visits) and costs of handling complications following hospitalization per RSV event. Indirect costs were evaluated in the scenario analysis as productivity loss due to premature death for RSV infection. A discount rate of 3.0% was applied only to mid-long-term costs and outcomes.

RESULTS

From the NHS perspective, over the first RSV season, nirsevimab in an all-infants population could be a cost-effective approach compared with palivizumab only in high-risk infants, with an EJP equal to €267, €365, and €400 considering a WTP threshold of €0, €22,000, and €30,000 per QALY saved, respectively. Considering only the palivizumab-eligible population, the model estimated that nirsevimab could be a cost-effective approach with an EJP equal to €3,467, €3,633, and €3,694 considering a WTP threshold of €0, €22,000, and €30,000 per QALY saved, respectively.

CONCLUSIONS

A prophylaxis strategy against RSV infection targeting all infants with nirsevimab could represent a cost-effective option for both NHS and societal perspectives, and supports the implementation and the equity of RSV prevention for all infants.

Economic impact of RSV infections in young children attending primary care: a prospective cohort study in five European countries, 2021 to 2023

BackgroundData on economic costs of respiratory syncytial virus (RSV) infections among children in primary care are scarce, although most RSV-infections are managed in this setting.AimTo estimate outpatient costs for RSV-positive children aged < 5 years.MethodsIn the RSV ComNet prospective cohort, children < 5 years with acute respiratory infection were recruited for RSV testing through primary care physicians in Belgium, Italy, the Netherlands, Spain and the United Kingdom (UK) during RSV seasons 2020/21 (UK only), 2021/22 and 2022/23. Outpatient healthcare utilisation and parental work absence were assessed over 30 days through parental questionnaires. Average costs per RSV episode were calculated from outpatient healthcare sector and societal perspectives, stratified by country and age.ResultsWe included 3,414 children and 1,124 (33%) tested RSV-positive. Physicians completed reports for 878 episodes, with follow-up questionnaire data for 819 (93%). Outpatient costs ranged from EUR 97 (95% CI: 91-104) in the Netherlands to EUR 300 (95% CI: 287-312) in Spain and were higher for infants than children aged 1-5 years. Societal costs ranged from EUR 454 (95% CI: 418-494) in the UK to EUR 994 (95% CI: 938-1,053) in Belgium. For children aged 1-5 years, societal costs were primarily driven by parental work absence. In infants, the main societal cost driver varied by country, but overall outpatient healthcare costs represented a higher proportion of societal costs vs older children.ConclusionRSV infections in children attending primary care result in substantial economic costs per episode, although differences exist across countries. This study provides essential data to inform cost-effectiveness analyses on novel RSV immunisations.

Cost-Effectiveness Analysis of Nirsevimab for Preventing Respiratory Syncytial Virus-Related Lower Respiratory Tract Disease in Dutch Infants: An Analysis Including All-Infant Protection

OBJECTIVES

This study aimed to assess the cost effectiveness of nirsevimab, a recently authorized monoclonal antibody (mAb) for the prevention of lower respiratory tract disease (LRTD) caused by respiratory syncytial virus (RSV), in comparison with the standard practice involving palivizumab for high-risk infants during their first RSV season in the Netherlands.

METHODS

A static cost-effectiveness model was populated for the Netherlands to evaluate different immunization strategies for nirsevimab over a single RSV season from a societal perspective. The model considered the most recently published RSV incidence data (average incidence from 2006 to2018), costs (adjusted to the 2023 price year), and associated health effects. Extensive scenario analyses were conducted to explore various strategies, and sensitivity analysis was performed to assess the model's robustness.

RESULTS

In the base-case scenario, all-infant protection-a strategy of in-season with catch-up immunization for all infants-nirsevimab has the potential to prevent numerous RSV-related cases, including 2333 hospitalizations and 150 intensive-care admissions, in the overall population compared with the standard of care. Nirsevimab appears to be cost effective under this strategy with an economically justifiable acquisition price for nirsevimab of €220 at a willingness-to-pay threshold of €50,000 per quality-adjusted life-year. Sensitivity analyses indicate a 52% probability that nirsevimab is cost effective at this threshold. Comparison of different vaccination strategies revealed that the all-infant protection approach was the one that prevented the higher number of cases.

CONCLUSIONS

This study indicates that universal infant immunization with nirsevimab has the potential to be cost effective and significantly reduces the burden of RSV among Dutch infants. These findings underscore the importance of implementing effective protective measures against RSV-LRTD, reducing the pressure on the healthcare system during the RSV season.

Prevention of respiratory syncytial virus disease across the lifespan in Italy

Respiratory syncytial virus (RSV) causes substantial morbidity and mortality across the lifespan, with the highest burden seen in infants and older adults. Recently approved immunizing agents, including long-acting neutralizing monoclonal antibodies and a maternal vaccine for passive immunization of newborns, and three vaccines for adults aged 60 years and older who are vulnerable to RSV disease, have the potential to prevent severe RSV-associated disease if implemented successfully. The use of these agents will be implemented in some Italian regions over the next few months, although no consistent timelines or decisions for adoption at the national level are expected. A multidisciplinary group of experts in neonatology, obstetrics and gynecology, respiratory medicine, geriatric medicine, hygiene, and public health reviewed the evidence on RSV prevention and present here their considerations on implementing an RSV prevention strategy in Italy. Given the associated disease burden, it is essential to move quickly to deploy these agents in vulnerable populations, enhance surveillance to accurately detect/predict seasonal trends in RSV activity and measure the impact of prevention strategies. Continuing research combined with widespread use of more sensitive testing is needed to identify vulnerable populations and risk factors. Policies are needed to support these preventive measures in the Italian healthcare system, and access must be accompanied by educational initiatives and advocacy to promote acceptance by HCPs and the target population.

Influential drivers of the cost-effectiveness of respiratory syncytial virus vaccination in European older adults: a multi-country analysis

BACKGROUND

We aimed to identify influential drivers of the cost-effectiveness of older adult respiratory syncytial virus (RSV) vaccination in Denmark, Finland, the Netherlands and Valencia-Spain.

METHODS

A static multi-cohort model was parameterised using country- and age-specific hospitalisations using three approaches: (A) the International Classification of Diseases (ICD)-coded hospitalisations, (B) laboratory RSV-confirmed hospitalisations and (C) time-series modelling (TSM). Plausible hypothetical RSV vaccine characteristics were derived from two protein subunit vaccines for adults aged ≥60 years. A full incremental analysis was conducted by comparing three RSV vaccination strategies: (1) in adults aged ≥60 years ("60y+"); (2) in adults aged ≥65 years ("65y+"); (3) in adults aged ≥75 years ("75y+") to "no intervention" and to each other. Both costs and quality-adjusted life-years (QALYs) were discounted at country-specific discount rates and the analysis was conducted from both the healthcare payers' and societal perspectives. Value of information, probabilistic sensitivity and scenario analyses identified influential drivers.

RESULTS

Besides vaccine price, the hospitalisation estimates were most influential: (A) Using adjusted RSV-ICD-coded hospitalisations at a vaccine price of €150 per dose, no intervention was cost-effective up to willingness-to-pay (WTP) values of €150,000 per QALY gained in Denmark and the Netherlands, and up to €124,000 per QALY gained in Finland. (B) Using the adjusted RSV-confirmed dataset, the findings were consistent in Denmark and comparable in Finland. In Spain-Valencia, the 75y+ strategy became cost-effective at WTP >€55,000. (C) Using TSM-based estimates, the 75y+ strategy was cost-effective at WTP >€45,000, >€101,000, >€41,000 and >€114,000 in Denmark, Finland, the Netherlands and Spain-Valencia, respectively. Sensitivity analyses showed that the (in-hospital) case fatality ratio and the specification of its age dependency were both influential. Duration of protection was found more influential than a variety of plausible waning patterns over the duration of protection.

CONCLUSIONS

Data gaps and uncertainties on the RSV-related burden in older adults persist and influence the cost-effectiveness of RSV vaccination. More refined age- and country-specific data on the RSV attributable burden are crucial to aid decision making.

Healthcare Resource Utilization and Economic Outcomes of RSV-Hospitalized Patients Aged ≥ 60 Years: A Retrospective Cohort Study

Background/Objectives The economic impact of respiratory syncytial virus (RSV) in Italy is not well defined. This analysis assessed the economic outcomes of RSV-hospitalized patients aged ≥ 60 years in Italy.

METHODS

Healthcare resource utilization and direct healthcare costs during the first RSV hospitalization and 12-month follow-up were collected from Italian administrative databases. A propensity-score-matched (PSM) analysis was performed between patients hospitalized for RSV and those hospitalized for any cause (without an RSV diagnosis).

RESULTS

Among 201 patients, an average of 1.95 hospitalizations, 19.38 prescriptions, and 7.11 outpatient services were reported during the first RSV hospitalization and the following 12 months. The mean direct healthcare costs were EUR 11,599 (related to hospitalization [79%], prescriptions [16%], and outpatient services [5%]). Following PSM analyses, direct healthcare costs were 15% higher for RSV-hospitalized patients versus those hospitalized for any cause (EUR 9369 versus EUR 8173; p < 0.05), driven by differences in hospitalizations (EUR 7477 versus EUR 6327; p < 0.05) and intensive care unit admissions (EUR 818 versus EUR 178; p = 0.001).

CONCLUSIONS

Despite a limited sample size, this study reports a substantial economic burden associated with RSV-hospitalized patients aged ≥ 60 years in Italy. The results provide important evidence to inform preventative RSV strategies to reduce the economic burden on the Italian National Health Service.

Knowledge and Attitudes Regarding Respiratory Syncytial Virus (RSV) Prevention: A Systematic Review

Background: New strategies for respiratory syncytial virus (RSV) prevention are available and are in development, but their acceptance is crucial to their effectiveness. Objectives: This systematic review aims to summarize current quantitative and qualitative evidence regarding knowledge and attitudes relating to RSV prevention. Methods: Six databases (PubMed, Scopus, APA PsycArticles; APA PsycInfo; CINAHL Complete; Psychology and Behavioral Sciences Collection) and two preprint repositories (medRxiv and Preprints) were searched up until 23 December 2024 (PROSPERO: CRD42024602351). Results: Sixty-one articles were included, focusing on vaccination for the elderly and adults at risk (n = 10) or pregnant people (n = 24, of which 8 also examined preferences for maternal vs. infant immunization) and infant immunization (n = 27, of which 16 focused on palivizumab, with 6 focusing on adherence to its monthly administration). Eighteen articles assessed attitudes in healthcare professionals. Overall, findings showed limited knowledge and awareness of RSV but generally positive attitudes towards prevention strategies and moderate to high intentions and uptake rates. Protection against the disease and perceived severity promoted acceptance, whereas concerns about side effects hindered it. Maternal vaccination was more acceptable than infant immunization. Conclusions: Attitudes towards RSV prevention options were generally favorable. Should more options become available, preferences may depend on which options are available, their characteristics, and how they are framed and presented. These insights highlight the importance of education on RSV grounded in decision-making literature, while recognizing the likely favorable reception of preventive measures across target age-populations.

Burden of RSV infections among young children in primary care: a prospective cohort study in five European countries (2021-23)

BACKGROUND

The majority of respiratory syncytial virus (RSV) infections in young children are managed in primary care, however, the disease burden in this setting remains poorly defined.

METHODS

We did a prospective cohort study in primary care settings in Belgium, Italy, Spain, the Netherlands, and the UK during the RSV seasons of 2020-21 (UK only; from Jan 1, 2021), 2021-22, and 2022-23. Children aged younger than 5 years presenting to their general practitioner or primary care paediatrician with symptoms of an acute respiratory tract infection were eligible for RSV testing. Children who tested positive for RSV were consented and followed up for 30 days via a physician clinical report (initial primary care visit on day 1) and two parent-report questionnaires (days 14 and 30). We assessed the burden of RSV in terms of clinical course (symptoms, illness duration, and complications), health-care resource utilisation (primary care visits, emergency department visits, hospitalisation rate, and medication use), and societal impact (daycare or school absence and parental work absence) for the 30-day follow-up period.

FINDINGS

Among 3414 tested children, 1124 (32·9%; 95% CI 31·3-34·5) tested positive for RSV. Among children with data on age, RSV positivity rate was 38·9% (36·1-41·7; n=466 of 1198) in children younger than 1 year and 25·9% (24·0-27·9; n=513 of 1979) in those aged 1 to <5 years. Of the 1124 RSV-positive children, 878 (78·1%) were enrolled and had day 1 data collected (median age 11·1 months [IQR 6·0-22·0]; 446 [50·9%] boys and 431 [49·1%] girls [N=877]). RSV illness lasted a mean of 11·7 days (95% CI 11·2-12·2; n=794). At day 14 and day 30, any remaining symptoms were reported in 451 of 804 (56·1% [95% CI 52·6-59·6]) and 261 of 724 (36·0% [32·6-39·7]) children. The mean number of primary care visits per child ranged from 1·4 (95% CI 1·2-1·6; the Netherlands) to 3·0 (2·8-3·3; Spain), and was higher in children younger than 1 year (2·7 visits [2·4-2·9]) than in those aged 1 to <5 years (2·1 [1·9-2·2]). Prescribed medication use varied, from 25 of 96 children (26·0% [95% CI 17·6-36·0]; the UK) to 228 of 297 children (76·8% [71·5-81·5]; Italy), with bronchodilators and antibiotics being the most commonly prescribed medicines across all countries. Prescribed medication use was reported in 258 of 418 children aged 1 to <5 years (61·7% [56·9-66·4]) and 196 of 394 children younger than 1 year (49·7% [44·7-54·8]). Missed working days by parents due to their child's RSV illness were reported in 340 of 744 cases (45·7% [42·1-49·4]); the mean number of missed workdays ranged from 1·3 days (95% CI 0·5-2·2) in Spain to 4·1 days (3·3-5·0) in Belgium.

INTERPRETATION

RSV infections in children younger than 5 years in primary care are associated with substantial symptomatology, health-care utilisation, and parental work absence. Notable differences in RSV burden existed across countries, likely due to differences in primary health-care systems, clinical practice, and health-care-seeking behaviour. This study emphasises the importance of considering country-specific primary care burden estimates when considering the implementation of RSV immunisations programmes.

FUNDING

Sanofi and AstraZeneca.

Economic Impact of Respiratory Syncytial Virus Infections in Children Under 5 Years of Age Attending Primary Care in Italy: A Prospective Cohort Study in Two Regions

BACKGROUND

Accurate cost estimates of respiratory syncytial virus (RSV) infections in primary care are limited, despite the majority of cases being managed in this setting. This study aims to estimate healthcare costs for children with RSV in primary care and the related costs of parental work absence.

METHODS

Children < 5 years of age with symptoms of acute respiratory infections were recruited via primary care paediatricians in two Italian regions for a prospective cohort study on the RSV burden in primary care, during the 2019/2020 winter. Healthcare utilization, medication use and parental work absence were assessed during a 14-day follow-up period. Average costs were estimated per RSV episode for the overall study population, as well as per age group.

RESULTS

Two hundred ninety three children were recruited, of which 119 tested RSV positive (41%) and 109 were included. In total, 89% of RSV-positive children (97/109) had ≥ 1 repeat paediatrician visit(s), and 10% (11/109) visited the ED. The mean number of repeat visits was 3.8 (SD: 4.0) and the mean duration of work absence 4.0 days (SD: 5.0). Average costs per RSV episode were €730 (95% CI: €691-€771), with direct medical costs accounting for 25% (€183 [95% CI: €174-€191]) and indirect costs related to work absence for 75% (€547 [95% CI: €509-€587]).

CONCLUSIONS

Costs associated with RSV infections in young children in primary care are considerable due to a substantial number of paediatrician visits and high rates of parental work absence. These costs are important to include in decision-making regarding the implementation of new RSV immunization strategies in national immunization programmes.

Health Preferences in Transition: Differences from Pandemic to Post-Pandemic in Valuation of COVID-19 and RSV Illness in Children and Adults

Objective: This study aimed to measure changes in preferences regarding health-related quality of life associated with COVID-19 and RSV illness in children and adults from 2021 (during the COVID-19 pandemic) to 2023 (post-pandemic). Methods: A stated-preference survey elicited time trade-off (TTO) values from US adults in spring 2021 (n = 1014) and summer 2023 (n = 1186). Respondents were asked to indicate how much time they would hypothetically be willing to trade from the end of their life to avoid the effects of varying severities of COVID-19 and RSV illness for: (1) children; (2) parents of an ill child (family spillover); and (3) adults. Attitudes relating to COVID-19 vaccination and data on experience with COVID-19 or RSV illness were also collected. The primary outcome measure was the loss in quality-adjusted life years (QALYs). Changes in preferences over the time period from 2021 to 2023 were evaluated using regression analysis. Results: QALY losses increased with disease severity and were highest for Long COVID. Across all COVID-19 and RSV health states, QALY losses associated with child health states were higher than family spillover or adult health states. In the regression analysis, QALY losses reported in the 2023 survey were significantly lower than 2021 QALY losses for COVID-19, but not RSV. Conclusions: Preferences may change over time in a pandemic context and therefore, economic analyses of pandemic interventions should consider the timeframe of health preference data collection to determine whether they are suitable to include in an economic evaluation. Even with the impacts on health-related quality of life attenuated over time, childhood illnesses still had a measurable impact on caregivers' quality of life.

Cost-effectiveness of anti-viral treatment for infants with RSV disease in the United Kingdom

BACKGROUND

Respiratory Syncytial Virus (RSV) is a common cause of hospitalisation in infants worldwide, causing significant morbidity and mortality. Recently, the antiviral treatment, Ziresovir, has shown promising results in a Phase III trial conducted on infants hospitalised with RSV. Based on these topline results, this study aims to investigate the cost-effectiveness of Ziresovir in the United Kingdom (UK).

METHODS

The cost-effective analysis (CEA) uses a proportional outcomes model using data from topline reports by the AIRFLO trial and published data to explore the effect of Ziresovir administration on hospitalised infants aged <24 months at admission. We estimated the reduction in ICU bed days and deaths and the maximum cost-effective price (MCEP) per treated individual, assuming a threshold of £20,000 per Quality-adjusted Life Year (QALY) gained.

RESULTS

Administering Ziresovir to all hospitalised infants averts four deaths (range: 2.8-4.5), 216 ICU admissions (range:160-260) and 3169 ICU bed-days (range: 2348-3804) per annum, the MCEP for Ziresovir per hospitalised infant is £429.65 (95 % CrI: £236-£771). If preterm infants are targeted, then the MCEP increases to £2108.38 (95 % Crl: £870-£3540). The MCEP for exclusively treating Infants with Chronic Lung Disease (CLD) and Congenital Heart Disease (CHD) is £6557.24 (95 % Crl: £1250 - £14,920) and £9459.44 (95 % Crl £3350-£20,300) respectively. The model is highly sensitive to changes in the efficacy of Ziresovir and the risk of ICU admission and mortality.

CONCLUSION

Ziresovir is a cost-effective intervention for all infants hospitalised with RSV if priced below £430 per dose and strategies that exclusively treat high-risk- with CLD and CHD infants justify a higher price of £6558 and £9460 respectively. The outcomes are highly sensitive to the efficacy of Ziresovir and can be improved when the full results of the AIRFLO trial are available.

Evaluating the Economic and Epidemiological Impact of RSV Hospitalizations in Southern Austria [Southern Austria Respiratory Syncytial Virus INpatient Investigation (ARNI Study)]

OBJECTIVE

RSV bronchiolitis is a leading cause of hospitalization in infants and young children. We aimed to document the economic burden and epidemiology of RSV over seven seasons in Southern Austria.

PATIENTS AND METHODS

All RSV-associated hospitalized (PCR-proven) children ≤ 5 years of age between 1 October 2015 and 30 April 2022 were collected retrospectively. Demographic and epidemiologic data, along with hospitalization costs (direct and indirect), were calculated.

RESULTS

Among 976 children hospitalized due to RSV infection, 87% were healthy term infants, and 79% were < 12 months old. Prematurity (13%) and pre-existing conditions (11%) significantly impacted older children-59% of cases in the 2nd compared with 68% in the 1st year of live. RSV-related hospital costs were approximately €2.0 millions per year (of a total of 60 millions per year). RSV accounted for 19% of hospitalizations due to acute respiratory illness (ARI) in children ≤ 5 years, 37% of all ARI < 6 months, 28% of all ARI < 12 and 6.3% of all-cause hospitalizations < 12 months of age, respectively.

CONCLUSIONS

Every 5th hospitalization due to respiratory illness in children ≤ 5 years of age was associated with RSV, representing 7.9% of all hospitalizations and 3.3% of all paediatric hospitalization costs.

Disease Burden Associated with All Infants in Their First RSV Season in the UK: A Static Model of Universal Immunization with Nirsevimab Against RSV-Related Outcomes

INTRODUCTION

Respiratory syncytial virus (RSV) leads to significant morbidity in newborn infants in the United Kingdom (UK). Nirsevimab, a long-acting monoclonal antibody, received approval from the European Medicines Agency and has been licensed by the Medicines and Healthcare products Regulatory Agency for preventing RSV lower respiratory tract disease (LRTD) in neonates and infants during their first RSV season. The objective of this study was to assess the potential impact of nirsevimab on RSV-associated LRTDs, related costs, and loss of quality-adjusted life years (QALYs) in infants experiencing their first RSV season.

METHODS

The impact of administering nirsevimab across all infant populations compared to palivizumab in the high-risk palivizumab-eligible population was assessed via a static decision-analytic model specified for a UK birth cohort experiencing their first RSV season. The RSV-related health events of interest included primary care (PC), accident and emergency (A&E) visits, hospitalizations [including hospitalizations alone and those resulting in intensive care unit (ICU) admissions], recurrent wheezing in infants who were previously hospitalized, and all-cause LRTD hospitalizations.

RESULTS

Under the current standard of practice (SoP), RSV was estimated to result in 329,425 RSV LRTDs annually, including 24,381 hospitalizations and ICU admissions, representing £117.8 million (2024 GBP) in costs. Comparatively, universal immunization of all infants with nirsevimab could avoid 198,886 RSV LRTDs, including 16,657 hospitalizations and ICU admissions, resulting in savings of £77.2 million in RSV treatment costs. Considering the impact on all-cause LRTD of a universal immunization strategy, nirsevimab could be valued between £243 and £274, assuming willingness-to-pay (WTP) thresholds of £20,000 and £30,000 per QALY saved, respectively.

CONCLUSIONS

This analysis demonstrated that the health and economic burden of RSV would be substantially reduced in all infants experiencing their first RSV season in the UK (including term, preterm, and palivizumab-eligible infants) as a result of a universal immunization strategy with nirsevimab.

Respiratory syncytial virus vaccination and immunoprophylaxis: realising the potential for protection of young children

The search for safe and efficacious products to prevent severe respiratory syncytial virus (RSV) disease in young infants has lasted more than 60 years. In high-income and middle-income countries, two new products have been authorised: an RSV monoclonal antibody for administration to infants (nirsevimab) and an RSV prefusion F maternal vaccine (RSVpreF [Pfizer, Puurs, Belgium]) for administration to pregnant people. These products are not yet available in low-income and lower-middle-income countries, where most RSV deaths occur. Other papers in this Series describe the acute burden of RSV disease in young children, the effects of RSV infection in early childhood on long-term lung health, and the burden of RSV disease and disease prevention products in older adults. In this Series paper, we briefly review the efficacy, effectiveness, and safety of nirsevimab and RSVpreF maternal vaccine for protection of infants. We then explore potential regulatory, policy, and implementation pathways and provide case studies of intervention uptake in Spain and Argentina, and considerations for use in Kenya. We also explore the health economic evidence to inform product introduction decisions. With sufficient political will and affordable pricing, RSV disease prevention in infants can become a global reality.

Impact of twelve immunization-preventable infectious diseases on population health using disability-adjusted life years (DALYs) in Spain

BACKGROUND

The objective of this study is to estimate the burden of selected immunization-preventable infectious diseases in Spain using the Burden of Communicable Diseases in Europe (BCoDE) methodology, as well as focusing on the national immunization programme and potential new inclusions.

METHODS

The BCoDE methodology relies on an incidence and pathogen-based approach to calculate disease burden via disability-adjusted life year (DALY) estimates. It considers short and long-term sequelae associated to an infection via outcome trees. The BCoDE toolkit was used to populate those trees with Spanish-specific incidence estimates, and de novo outcome trees were developed for four infections (herpes zoster, rotavirus, respiratory syncytial virus [RSV], and varicella) not covered by the toolkit. Age/sex specific incidences were estimated based on data from the Spanish Network of Epidemiological Surveillance; hospitalisation and mortality rates were collected from the Minimum Basic Data Set. A literature review was performed to design the de novo models and obtain the rest of the parameters. The methodology, assumptions, data inputs and results were validated by a group of experts in epidemiology and disease modelling, immunization and public health policy.

RESULTS

The total burden of disease amounted to 163.54 annual DALYs/100,000 population. Among the selected twelve diseases, respiratory infections represented around 90% of the total burden. Influenza exhibited the highest burden, with 110.00 DALYs/100,000 population, followed by invasive pneumococcal disease and RSV, with 25.20 and 10.57 DALYs/100,000 population, respectively. Herpes zoster, invasive meningococcal disease, invasive Haemophilus influenza infection and hepatitis B virus infection ranked lower with fewer than 10 DALYs/100,000 population each, while the rest of the infections had a limited burden (< 1 DALY/100,000 population). A higher burden of disease was observed in the elderly (≥ 60 years) and children < 5 years, with influenza being the main cause. In infants < 1 year, RSV represented the greatest burden.

CONCLUSIONS

Aligned with the BCoDE study, the results of this analysis show a persisting high burden of immunization-preventable respiratory infections in Spain and, for the first time, highlight a high number of DALYs due to RSV. These estimates provide a basis to guide prevention strategies and make public health decisions to prioritise interventions and allocate healthcare resources in Spain.

Burden of respiratory syncytial virus in older adults in Taiwan: An expert perspective on knowledge gaps

The burden of respiratory syncytial virus (RSV) infection among older adults in Taiwan is not well understood due to a scarcity of published epidemiological data. Nonetheless, the increasing proportion of older adults is anticipated to translate to increased burden of RSV infection, presenting a challenge to the healthcare system. Thus, an expert meeting was convened among a panel of infectious disease specialists from Taiwan to evaluate the existing local evidence and data gaps related to RSV infection in older adults (aged ≥50 years), and propose steps to generating evidence on disease burden among this population. Overall, there are few studies on the clinical and economic burden of RSV infection in Taiwan, and existing data are limited by small sample sizes and highly selected populations. Inconsistent RSV testing practices among older adults contribute to under-diagnosis and under-reporting, driven by limitations to reimbursement policies that discourage proactive RSV testing in older adults, and the lack of appropriate, targeted RSV treatment. Crucially, the paucity of epidemiological data may perpetuate a lack of awareness of RSV among clinicians and the public, hinder investments into RSV testing at a policymaker level, and thereby impede implementation of consistent diagnostic practices, precluding a deeper understanding of RSV. To overcome these challenges, it is imperative to prioritize generation of epidemiological data to establish the burden of RSV infection among older adults in Taiwan. Such data would also support a multi-stakeholder group in assessing the impact of future RSV-related interventions, such as educational initiatives and preventative strategies including vaccines.

Effectiveness and impact of universal prophylaxis with nirsevimab in infants against hospitalisation for respiratory syncytial virus in Galicia, Spain: initial results of a population-based longitudinal study

BACKGROUND

Galicia (Spain) was one of the first regions worldwide to incorporate nirsevimab for universal respiratory syncytial virus (RSV) prophylaxis in infants into its immunisation programme. The NIRSE-GAL longitudinal population-based study aimed to assess nirsevimab effectiveness in preventing hospitalisations (ie, admittance to hospital).

METHODS

The 2023-24 immunisation campaign with nirsevimab in Galicia began on Sept 25, 2023, and concluded on March 31, 2024. The campaign targeted three groups: infants born during the campaign (seasonal group), infants younger than 6 months at the start of the campaign (catch-up group), and infants aged 6-24 months with high-risk factors at the start of the campaign (high-risk group). Infants in the seasonal group were offered immunisation on the first day of life before discharge from hospital. Infants in the catch-up and high-risk groups received electronic appointments to attend a public hospital or health-care centre for nirsevimab administration. For this interim analysis, we used data collected from Sept 25 to Dec 31, 2023, from children born up to Dec 15, 2023. Data were retrieved from public health registries. Nirsevimab effectiveness in preventing RSV-associated lower respiratory tract infection (LRTI) hospitalisations; severe RSV-related LRTI requiring intensive care unit admission, mechanical ventilation, or oxygen support; all-cause LRTI hospitalisations; and all-cause hospitalisations was estimated using adjusted Poisson regression models. Data from five past RSV seasons (2016-17, 2017-18, 2018-19, 2019-20, and 2022-23), excluding the COVID-19 pandemic period, were used to estimate the number of RSV-related LRTI hospitalisations averted along with its IQR. The number needed to immunise to avoid one case in the 2023-24 season was then estimated from the averted cases. Nirsevimab safety was routinely monitored. The NIRSE-GAL study protocol was registered on ClinicalTrials.gov (NCT06180993), and follow-up of participants is ongoing.

FINDINGS

9408 (91·7%) of 10 259 eligible infants in the seasonal and catch-up groups received nirsevimab, including 6220 (89·9%) of 6919 in the catch-up group and 3188 (95·4%) of 3340 in the seasonal group. 360 in the high-risk group were offered nirsevimab, 348 (97%) of whom received it. Only infants in the seasonal and catch-up groups were included in analyses to estimate nirsevimab effectiveness and impact because there were too few events in the high-risk group. In the catch-up and seasonal groups combined, 30 (0·3%) of 9408 infants who received nirsevimab and 16 (1·9%) of 851 who did not receive nirsevimab were hospitalised for RSV-related LRTI, corresponding to an effectiveness of 82·0% (95% CI 65·6-90·2). Effectiveness was 86·9% (69·1-94·2) against severe RSV-related LRTI requiring oxygen support, 69·2% (55·9-78·0) against all-cause LRTI hospitalisations, and 66·2% (56·0-73·7) against all-cause hospitalisations. Nirsevimab effectiveness against other endpoints of severe RSV-related LRTI could not be estimated because of too few events. RSV-related LRTI hospitalisations were reduced by 89·8% (IQR 87·5-90·3), and the number needed to immunise to avoid one RSV-related LRTI hospitalisation was 25 (IQR 24-32). No severe adverse events related to nirsevimab were registered.

INTERPRETATION

Nirsevimab substantially reduced infant hospitalisations for RSV-associated LRTI, severe RSV-associated LRTI requiring oxygen, and all-cause LRTI when given in real-world conditions. These findings offer policy makers and health authorities robust, real-world, population-based evidence to guide the development of strategies for RSV prevention.

FUNDING

Sanofi and AstraZeneca.

TRANSLATION

For the Spanish translation of the abstract see Supplementary Materials section.

Respiratory Syncytial Virus Infections in Recipients of Bone Marrow Transplants: A Systematic Review and Meta-Analysis

Human Respiratory Syncytial Virus (RSV) is a common cause of respiratory tract infections. Usually associated with infants and children, an increasing amount of evidence suggests that RSV can cause substantial morbidity and mortality in immunocompromised individuals, including recipients of bone marrow transplantation (BMT). The present systematic review was therefore designed in accordance with the PRISMA guidelines to collect available evidence about RSV infections in BMT recipients. Three medical databases (PubMed, Embase, and MedRxiv) were therefore searched for eligible observational studies published up to 30 September 2023 and collected cases were pooled in a random-effects model. Heterogeneity was assessed using I2 statistics. Reporting bias was assessed by means of funnel plots and regression analysis. Overall, 30 studies were retrieved, including 20,067 BMT cases and 821 RSV infection episodes. Of them, 351 were lower respiratory tract infections, and a total of 78 RSV-related deaths were collected. A pooled attack rate of 5.40% (95% confidence interval [95%CI] 3.81 to 7.60) was identified, with a corresponding incidence rate of 14.77 cases per 1000 person-years (95%CI 9.43 to 20.11), and a case fatality ratio (CFR) of 7.28% (95%CI 4.94 to 10.60). Attack rates were higher in adults (8.49%, 95%CI 5.16 to 13.67) than in children (4.79%, 95%CI 3.05 to 7.45), with similar CFR (5.99%, 95%CI 2.31 to 14.63 vs. 5.85%, 95%CI 3.35 to 10.02). By assuming RSV attack rates as a reference group, influenza (RR 0.518; 95%CI 0.446 to 0.601), adenovirus (RR 0.679, 95%CI 0.553 to 0.830), and human metapneumovirus (RR 0.536, 95%CI 0.438 to 0.655) were associated with a substantially reduced risk for developing corresponding respiratory infection. Despite the heterogeneous settings and the uneven proportion of adult and pediatric cases, our study has identified high attack rates and a substantial CFR of RSV in recipients of BMT, stressing the importance of specifically tailored preventive strategies and the need for effective treatment options.

Respiratory Syncytial Virus-Associated Hospitalizations in Children: A 10-Year Population-Based Analysis in Finland, 2008-2018

BACKGROUND

The risk of respiratory syncytial virus (RSV) hospitalization is highest during the first months of life, but few studies have assessed the population-based rates of hospitalization in monthly age groups of infants.

METHODS

We determined the average population-based rates of hospitalization with virologically confirmed RSV infections in children ≤15 years of age admitted during the 10-year period of 2008-2018. Testing for RSV was routine in all children hospitalized with respiratory infections, and all RSV-positive children admitted at any time during the study period were included in the analyses.

RESULTS

The annual population-based rate of RSV hospitalization was highest in infants 1 month of age (52.0 per 1000 children; 95% CI, 45.2-59.7), followed by infants <1 month of age (34.8 per 1000; 95% CI, 29.2-41.1) and those 2 months of age (32.2 per 1000; 95% CI, 26.9-38.4). In cumulative age groups, the rate of hospitalization was 39.7 per 1000 (95% CI, 36.2-43.4) among infants <3 months of age, 26.8 per 1000 (95% CI, 24.8-29.0) in infants aged <6 months, and 15.8 per 1000 (95% CI, 14.7-17.0) in those <12 months of age.

CONCLUSION

In monthly age groups of infants, the incidence rates of virologically confirmed RSV hospitalization in all infants up to 3 months of age were substantially higher than those reported in earlier studies. These data may be important for improving the estimates of the cost-effectiveness of various interventions to reduce the burden of RSV in young infants.

Substantial Burden of Nonmedically Attended RSV Infection in Healthy-Term Infants: An International Prospective Birth Cohort Study

BACKGROUND

During the first year of life, 1 in 4 infants develops a symptomatic respiratory syncytial virus (RSV) infection, yet only half seek medical attention. The current focus on medically attended RSV therefore underrepresents the true societal burden of RSV. We assessed the burden of nonmedically attended RSV infections and compared with medically attended RSV.

METHODS

We performed active RSV surveillance until the age of 1 year in a cohort (n = 993) nested within the Respiratory Syncytial Virus Consortium in EUrope (RESCEU) prospective birth cohort study enrolling healthy term-born infants in 5 European countries. Symptoms, medication use, wheezing, and impact on family life were analyzed.

RESULTS

For 97 of 120 (80.1%) nonmedically attended RSV episodes, sufficient data were available for analysis. In 50.5% (49/97), symptoms lasted ≥15 days. Parents reported impairment in usual daily activities in 59.8% (58/97) of episodes; worries, 75.3% (73/97); anxiety, 34.0% (33/97); and work absenteeism, 10.8% (10/93). Compared with medically attended RSV (n = 102, 9 hospital admissions), Respiratory Syncytial Virus NETwork (ReSViNET) severity scores were lower (3.5 vs 4.6, P < .001), whereas duration of respiratory symptoms and was comparable.

CONCLUSIONS

Even when medical attendance is not required, RSV infection poses a substantial burden to infants, families, and society. These findings are important for policy makers when considering the implementation of RSV immunization. Clinical Trials Registration. ClinicalTrials.gov (NCT03627572).

Characterisation of RSV infections in children without chronic diseases aged 0-36 months during the post-COVID-19 winter season 2022/2023

Background

Respiratory syncytial virus (RSV) is one of the leading causes of hospitalisation, morbidity, and mortality due to respiratory infection in the first years of life. This longitudinal prospective study outlines the 2022/23 season's viral patterns in Austria after the epidemiological changes determined by public health measures. We aimed to highlight differences within the RSV subtypes and genotypes in 0-36-month-old children without chronic diseases in the outpatient setting.

Methods

From November 2022 to March 2023 children younger than 36 months admitted to Vienna's largest paediatric primary healthcare centre with an acute respiratory infection were enrolled in this study. Nasal swabs and multiplex PCR panels detected 20 viruses including RSV subtypes and genotypes. Clinical presentation, features, and treatment of the participants were documented and analysed using the Modified Tal Score (MTS). Patients were scheduled for a telemedical follow-up one week after the initial appointment. Analysis was done using descriptive statistics, including Cramér V and binominal logarithmic regression.

Results

Among the 345 samples from 329 children, RSV was the most common virus (31.9%), followed by influenza (17.5%) and rhinovirus infections (20.58%). Of the RSV positive samples, only 13 cases were RSV subtype A (11.8%), whereas 97 were of subtype B (87.3%); ON1 and BA9 were the only detectable RSV genotypes (ON1: BA9 = 1:9.25). RSV was the main predictor of hospitalisation (OR: 7.5, 95% CI: (1.46-38.40), and age had a significant but smaller effect (OR: 0.89, 95% CI: (0.81-0.99). Almost all patients' clinical status improved within the first days.

Conclusion

RSV cases showed a rapid onset in late November 2022, and subtype B was predominant throughout the season. RSV infection was associated with higher hospitalisation rates, even after excluding high-risk patients (preterm and severe chronic diseases population).Further testing in the upcoming winter seasons will improve our knowledge of the dominant subtype and its association with disease severity, especially with the development of novel RSV vaccine candidates.

The role of real-world evidence for regulatory and public health decision-making for Accelerated Vaccine Deployment- a meeting report

The COVID-19 pandemic underscored the need for rapid evidence generation to inform public health decisions beyond the limitations of conventional clinical trials. This report summarises presentations and discussions from a conference on the role of Real-World Evidence (RWE) in expediting vaccine deployment. Attended by regulatory bodies, public health entities, and industry experts, the gathering was a collaborative exchange of experiences and recommendations for leveraging RWE for vaccine deployment. RWE proved instrumental in refining decision-making processes to optimise dosing regimens, enhance guidance on target populations, and steer vaccination strategies against emerging variants. Participants felt that RWE was successfully integrated into lifecycle management, encompassing boosters and safety considerations. However, challenges emerged, prompting a call for improvements in data quality, standardisation, and availability, acknowledging the variability and potential inaccuracies in data across diverse healthcare systems. Regulatory transparency should also be prioritised to foster public trust, and improved collaborations with governments are needed to streamline data collection and navigate data privacy regulations. Moreover, building and sustaining resources, expertise, and infrastructure in LMICs emerged as imperative for RWE-generating capabilities. Continued stakeholder collaboration and securing adequate funding emerged as vital pillars for advancing the use of RWE in shaping responsive and effective public health strategies.

Respiratory Syncytial Virus, Influenza and SARS-CoV-2 in Homeless People from Urban Shelters: A Systematic Review and Meta-Analysis (2023)

Homeless people (HP) are disproportionally affected by respiratory disorders, including pneumococcal and mycobacterial infections. On the contrary, more limited evidence has been previously gathered on influenza and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and very little is known about the occurrence of human respiratory syncytial virus (RSV), a common cause of respiratory tract infections among children and the elderly. The present systematic review was designed to collect available evidence about RSV, influenza and SARS-CoV-2 infections in HP, focusing on those from urban homeless shelters. Three medical databases (PubMed, Embase and Scopus) and the preprint repository medRxiv.org were therefore searched for eligible observational studies published up to 30 December 2023, and the collected cases were pooled in a random-effects model. Heterogeneity was assessed using the I2 statistics. Reporting bias was assessed by funnel plots and a regression analysis. Overall, 31 studies were retrieved, and of them, 17 reported on the point prevalence of respiratory pathogens, with pooled estimates of 4.91 cases per 1000 HP (95%CI: 2.46 to 9.80) for RSV, 3.47 per 1000 HP for influenza and 40.21 cases per 1000 HP (95%CI: 14.66 to 105.55) for SARS-CoV-2. Incidence estimates were calculated from 12 studies, and SARS-CoV-2 was characterized by the highest occurrence (9.58 diagnoses per 1000 persons-months, 95%CI: 3.00 to 16.16), followed by influenza (6.07, 95%CI: 0.00 to 15.06) and RSV (1.71, 95%CI: 0.00 to 4.13). Only four studies reported on the outcome of viral infections in HP: the assessed pathogens were associated with a high likelihood of hospitalization, while high rates of recurrence and eventual deaths were reported in cases of RSV infections. In summary, RSV, influenza and SARS-CoV-2 infections were documented in HP from urban shelters, and their potential outcomes stress the importance of specifically tailored preventive strategies.

Early lessons from the implementation of universal respiratory syncytial virus prophylaxis in infants with long-acting monoclonal antibodies, Galicia, Spain, September and October 2023

A monoclonal antibody for universal respiratory syncytial virus prophylaxis in infants has recently been licensed. We share our experiences of integrating nirsevimab into the regional immunisation programme in Galicia, Spain. After a 3-week hospital-based immunisation campaign with flexible individualised appointments and educational activities, nirsevimab uptake was 97.5% in the high-risk group, 81.4% in the catch-up group and 92.6% in infants born during the campaign. This successful implementation strategy can serve as a model and may inform other countries' programmatic deliberations.

Extracellular Vesicles and Their Role in Lung Infections

Lung infections are one of the most common causes of death and morbidity worldwide. Both bacterial and viral lung infections cause a vast number of infections with varying severities. Extracellular vesicles (EVs) produced by different cells due to infection in the lung have the ability to modify the immune system, leading to either better immune response or worsening of the disease. It has been shown that both bacteria and viruses have the ability to produce their EVs and stimulate the immune system for that. In this review, we investigate topics from EV biogenesis and types of EVs to lung bacterial and viral infections caused by various bacterial species. Mycobacterium tuberculosis, Staphylococcus aureus, and Streptococcus pneumoniae infections are covered intensively in this review. Moreover, various viral lung infections, including SARS-CoV-2 infections, have been depicted extensively. In this review, we focus on eukaryotic-cell-derived EVs as an important component of disease pathogenesis. Finally, this review holds high novelty in its findings and literature review. It represents the first time to cover all different information on immune-cell-derived EVs in both bacterial and viral lung infections.

RSV Burden and Its Impact on Pediatric Inpatient Bed Occupancy in Belgium: An Analysis of National Hospital Claims Data

BACKGROUND

Respiratory syncytial virus (RSV) infections represent a substantial burden on pediatric services during winter. While the morbidity and financial burden of RSV are well studied, less is known about the organizational impact on hospital services (ie, impact on bed capacity and overcrowding and variation across hospitals).

METHODS

Retrospective analysis of the population-wide Belgian Hospital Discharge Data Set for the years 2017 and 2018 (including all hospital sites with pediatric inpatient services), covering all RSV-associated (RSV-related International Classification of Diseases, 10th Version, Clinical Modification diagnoses) inpatient hospitalization by children under 5 years old as well as all-cause acute hospitalizations in pediatric wards.

RESULTS

RSV hospitalizations amount to 68.3 hospitalizations per 1000 children less than 1 year and 5.0 per 1000 children 1-4 years of age and are responsible for 20%-40% of occupied beds during the peak period (November-December). The mean bed occupancy rate over the entire year (2018) varies across hospitals from 22.8% to 85.1% and from 30.4% to 95.1% during the peak period. Small-scale pediatric services (<25 beds) are more vulnerable to the volatility of occupancy rates. Forty-six hospital sites have daily occupancy rates above 100% (median of 9 days). Only in 1 of 23 geographically defined hospital networks these high occupancy rates are on the same calendar days.

CONCLUSIONS

Pediatric services tend to be over-dimensioned to deal with peak activity mainly attributable to RSV. RSV immunization can substantially reduce pediatric capacity requirements. Enhanced collaboration in regional networks is an alternative strategy to deal with peaks and reduce capacity needs.

The Path Towards Effective Respiratory Syncytial Virus Immunization Policies: Recommended Actions

The respiratory syncytial virus (RSV) causes a substantial burden worldwide. After over six decades of research, there is finally a licensed immunization option that can protect the broad infant population, and other will follow soon. RSV immunization should be in place from season 2023/2024 onwards. Doing so requires thoughtful but swift steps. This paper reflects the view of four immunization experts on the efforts being made across the globe to accommodate the new immunization options and provides recommendations organized around five priorities: (I) documenting the burden of RSV in specific populations; (II) expanding RSV diagnostic capacity in clinical practice; (III) strengthening RSV surveillance; (IV) planning for the new preventive options; (V) achieving immunization targets. Overall, Spain has been a notable example of converting RSV prevention into a national desideratum and has pioneered the inclusion of RSV in some of the regional immunization calendars for infants facing their first RSV season.

Respiratory Syncytial Virus: A Systematic Review and Meta-Analysis of Tomographic Findings (2000-2022)

Human respiratory syncytial virus (RSV) is a main cause of medical referrals and hospitalizations in all infants, particularly among newborns. Nevertheless, relatively limited evidence on chest tomography (CT) findings has been collected. According to the PRISMA statement, Pubmed, Embase, and medRxiv were searched for eligible observational studies published up to 31 December 2022. Cases were categorized in children and adolescents (age < 18 years), adults and elderly (age ≥ 18 years), and immunocompromised patients, and then pooled in a random-effects model. Heterogeneity was assessed using the I2 statistics, while reporting bias was assessed by means of funnel plots and regression analysis. A total of 10 studies (217 RSV cases) were retrieved (children, 37.3%; immunocompromised, 41.0%; adults, 21.7%). The most common features were signs of organizing pneumonia (33.65%, 95% confidence interval [95% CI] 22.39-47.27), followed by septal thickening (33.19%, 95% CI 21.76-47.03), ground glass opacities (GGOs; 28.03%, 95% CI 14.69-46.82), and tree-in-bud (TIB, 27.44%, 95% CI 15.04-44.68). Interestingly, up to 16.23% (95% CI 8.17-29.69) showed normal findings, while the large majority (76.06%, 95% CI 64.81-84.56) were characterized by bilateral involvement. Studies were highly heterogeneous without substantial reporting bias. Assuming children and adolescents as reference groups, healthy adults were characterized by a higher risk ratio [RR] for septal thickening (RR 3.878, 95% CI 1.253-12.000), nodular lesions (RR 20.197, 95% CI 1.286-317.082), and GGOs (RR 2.121, 95% CI 1.121-4.013). RSV cases are rarely assessed in terms of CT characteristics. Our study identified some specificities, suggesting that RSV infections evolve heterogeneous CT features in children/adolescents and adults, but the paucity of studies recommends a cautious appraisal.

ResQ Family: Respiratory Syncytial Virus (RSV) Infection in Infants and Quality of Life of Families-Study Protocol of a Multi-Country Family Cohort Study

(1) Respiratory syncytial virus (RSV) infection in infants not only affects the child itself, but also their families. Nevertheless, information on the overall impact is scarce. A comprehensive caregiver-specific approach covering essential (health) dimensions and relevant stakeholders was initiated under the ResQ Family study conducted in Germany, France, Italy and Sweden. The primary objective is to investigate the health-related quality of life of parents and/or caregivers of children (<24 months) hospitalised for RSV. (2) Each participant completes an online questionnaire disseminated via social media and printed material in hospitals. Using the PedsQLTM FIM as well as further self-designed questions, parent and patient characteristics as well as potential stressors and preventive factors are recorded at baseline and after six weeks. Multivariate regression models with health-related quality of life as main outcome parameter will be conducted. (3) The study is currently in the recruitment process. A full analysis will be performed once the data collection phase is complete. First results are to be expected in late 2023. (4) Publishing the results in the form of scientific papers but also non-scientific (information) material will help us raise awareness for RSV and the importance of prevention among healthcare professionals, patient representatives and decision-makers.