Clinical Research Directory

A Study to Investigate the Efficacy and Safety of Zelicapavir Compared With Placebo in Adults With RSV Who Are at High Risk for Severe Disease

Zelicapavir is a novel orally administered non-fusion replication inhibitor of RSV that is being developed for the treatment of patients with RSV infection. This phase 2b/3 study will evaluate the efficacy and safety of zelicapavir compared with placebo in adults with RSV who are at high risk for severe disease. High-risk participants include those who are either ≥75 years of age or ≥18 years of age with COPD and/or CHF. Participants will be non-hospitalized adults who have up to 72 hours of respiratory tract infection symptoms and test positive for RSV.

Clinical Outcomes and Pharmacotherapy Effectiveness in the VA Health Care System (COPE-VA)

The purpose of this study is to comprehensively describe the temporal and geographic utilization of COVID-19 therapies used for mild to moderate disease during different periods of SARS-CoV-2 variant circulation as well as to compare demographic and clinical characteristics of Veterans who are treated or do not receive these different therapies. The investigators will also perform similar descriptive epidemiology for other respiratory viruses, including RSV and influenza and other infectious diseases. This first phase will critically inform feasibility and direction of the second phase, in which the investigators will use target trial emulation design to study the comparative effectiveness of therapies and vaccines for COVID-19, respiratory viruses, including RSV, and influenza, and other infectious diseases.

Concurrent Versus Sequential Administration of Tdap and RSV Vaccines in Pregnancy

The goal of this clinical trial is to learn if the RSV vaccine (protects against respiratory syncytial virus) and Tdap vaccine (protects against pertussis) are most effective in pregnant individuals when taken together at the same visit, or separately at different visits. This clinical trial will also learn about the safety and immune responses of these vaccines in pregnancy. The Main question: -Is it possible to run a successful trial that tests how safe and effective it is to give Tdap and RSV vaccines in pregnancy either at the same time or one after the other, at different visits? The Secondary question: -To determine how safe and how well the Tdap and RSV vaccines work when given in pregnancy either at the same time or one after the other, at different visits. The Exploratory (optional participation) questions: * To measure the levels of antibodies against whooping cough (pertussis) and RSV in mothers at 7 and 19 months after giving birth, depending on whether they got the vaccines at the same time or one after the other during pregnancy. * To measure whooping cough antibody levels in the babies at 2, 7, and 19 months of age, whose mothers who received the vaccines in pregnancy. * To measure the levels of RSV antibodies in the mothers' breast milk at 1 week, 2 weeks, 4 weeks, and 2 months after giving birth. Participants will be randomly assigned to Group 1 (vaccines given at the same time, same visit) or Group 2 (vaccines given one after the other, at different visits). There are 4 visits as part of the main study, and 6 additional visits as part of the optional study (exploratory questions). Visit 1-2: Blood collection and vaccines administered Visit 3-4: Blood work (cord blood sample collection from infant, after delivery, if possible) Visit 5-8: Breast milk collection Visit 8-10: Blood collection (infant blood collection only at Visit 8). Participants will be asked to keep a diary of symptoms throughout the study.

Usability and Clinical Validation of the Flu A/B/COVID-19 + RSV Multiplex Rapid Test

This will be a prospective study for the clinical validation of the CorDx Tyfast Flu A/B/COVID-19 + RSV Multiplex Rapid Test for the qualitative detection and differentiation of SARS-CoV-2, Influenza A, Influenza B and RSV in AN samples. Results from the CorDx Tyfast Flu A/B/COVID-19 + RSV Multiplex Rapid Test will be compared to results from a 510(k) cleared highly sensitive, multi-analyte reverse transcriptase polymerase chain reaction (RT-PCR) test for SARS-CoV-2, Influenza A, Influenza B and RSV, such as the 510(k) cleared Cepheid Xpert Xpress CoV-2/Flu/RSV plus (K250995).

RSV Burden in Hong Kong

RSV infection causes significant mortality and morbidity in susceptible adults. There are many publications on the global RSV disease burden in infants and young children but data on adults are lacking with lots of knowledge gaps. Currently there is no established effective antiviral therapy for RSV. RSV vaccines have recently become available commercially but the Center for Health Protection (Hong Kong) has yet to discuss procurement of RSV vaccines for the high risk groups. Thus a prospective study to assess the disease burden of RSV infection in adults would be of great interest.

Stakeholder-Informed RSV Prevention Economic Model in Botswana

The goal of this mixed methods study is to engage stakeholders to develop a health economic model to estimate the costs, health benefits, and value of respiratory syncytial virus (RSV) prevention strategies. The model will help decision-makers in Botswana determine whether and how to introduce RSV prevention interventions for infants, including monoclonal antibodies. The main questions the study aims to answer are: How could RSV prevention strategies be delivered to infants in Botswana? What costs, health benefits, and implementation factors should be included in a health economic model? What information do policymakers, healthcare providers, funders, researchers, and other stakeholders need to make decisions about RSV prevention? Participants will include key stakeholders involved in health policy, clinical care, financing, research, and child health in Botswana. Participants may be asked to complete an interview, take part in a stakeholder workshop, complete a survey, and help review or interpret model findings. The study will not test an RSV product in infants or provide medical treatment.

Surveillance, Assessment and Detection of Influenza Associated Respiratory Infections in HIV Positive and Negative Individual in Lusaka, Zambia.

Background and rationale:The World Health Organisation (WHO), estimates influenza global deaths at 290,000 to 650,000 annually. Although influenza is mostly associated with upper respiratory tract infections (URTIs), its role in lower respiratory tract infections (LRTIs) and the associated poor clinical outcomes have been overlooked in sub-Saharan Africa. A study conducted in eight SSA countries estimated that 8.2% of cases and 2.8% of deaths from LRTIs were due to primary infection with influenza. Pneumonia and influenza-associated illness are responsible for 8.5% of respiratory deaths in Zambia. However, in routine practice, testing to distinguish between bacterial and viral etiology of RTIs is seldom done outside sentinel surveillance due to the high cost and lack of available testing options. This consequently underestimates viral RTIs in the population. It is particularly important to diagnose flu early on in vulnerable populations so that they receive timely and appropriate medical care. Although Zambia is a high HIV burden country with a prevalence of 11%, there is presently no study that has described the burden of influenza in the HIV positive population. This research study will address gaps in current scientific knowledge, providing key insights about the prevalence, circulating types, seasonality and associated clinical outcomes of influenza, RSV and SARS-CoV-2 infection in Zambia in the post COVID-19 era. Objectives Primary To determine the prevalence of influenza (A and/or B) infections in a high HIV burden setting in Lusaka, Zambia over one or more influenza seasons. Secondary 1. To determine the prevalence of influenza co-infection with RSV and/or SARS-CoV-2 2. To determine the clinical outcomes of influenza (A and/or B) infection among Zambian adults, with and without co-infection with RSV and COVID-19, by HIV and COVID-19 vaccination status. 3. To evaluate the accuracy and yield of aerosol-based sampling for diagnosis of respiratory viruses (influenza, SARS-CoV-2, and RSV) compared to nasal/ nasopharyngeal swabs, for rapid diagnosis of infection among symptomatic individuals in Zambia. 4. To evaluate the acceptability of exhaled breath aerosol (XBA) sampling for diagnosis and screening of respiratory infections of pandemic potential. Study design and participants: Primary objective and secondary objective 1: Cross sectional surveillance study of individuals presenting with flu-like symptoms at two first level hospitals in Lusaka, Zambia. Recruitment of 594 participants will be done over the study period and participants will include both males and females presenting with 2-7 days of flu-like symptoms, able to provide informed consent, aged ≥18 years, with a known HIV status or willing to be tested, with a known COVID 19 vaccination status and available for symptom follow-up. Secondary objective 2: Prospective follow up of participants enrolled in aim 1 for 14 days will be done to document clinical symptom progression and outcomes. Appropriate care will be provided to all participants within routine care services. Secondary objective 3 \& 4: Mixed methods approach. All patients enrolled under aim 1 will be requested to provide in addition to the routine nasopharyngeal sample, an aerosol-based sample for diagnostic accuracy and yield evaluation. We will also conduct an investigator-administered questionnaire to ascertain end-user experience and preferences for either sampling method. Location Zambia (Kanyama and Chawama sub-districts) Duration April 2025 to November 2026 (Participant enrolment duration)

Immune Reponses to RSV B Challenge in Older Adults (A Controlled Human Infection Study With RSV in Older People-02)

This is a human challenge sequential cohort study involving healthy, non-smoking older adults aged 65-75 years. We aim to enrol 20 participants. There will be a sentinel cohort of 6 participants at the beginning of the study (Group 1). If no pausing rules are met, the remaining 14 participants will be enrolled for a total of 20 enrolled participants (Group 2). The study will consist of three main phases: (1) screening and baseline, (2) inoculation and quarantine, and (3) follow up. All participants will attend a screening visit for a comprehensive health assessment to confirm eligibility. If eligible, participants will take part in an inpatient stay in a quarantine unit, where they will be inoculated with 105 plaque-forming units of RSV B-I54 by intranasal drops. The inoculation dose has been determined in the earlier mentioned outpatient study of the same virus strain, in healthy young adults. Due to the older age range and potentially increased risk of more severe disease, participants will remain within the quarantine unit for 10-days post inoculation and will be closely monitored by clinical review and self-completed symptom diaries. Participants will undergo daily sample collection and will remain in quarantine until the discharge criteria are met at Day 10. After discharge, participants will attend follow-up visits at Day 14, Day 28, and Day 90. Participants in Group 2 will have an additional baseline visit at Day -14 where blood, respiratory (nose and throat) and lower airway (bronchoscopy) samples will be collected. Group 2 participants will also undergo a second bronchoscopy during the inpatient period and the third and final bronchoscopy at Day 28. Clinical outcomes will be determined by symptomatology and viral detection in nasal lavage using quantitative PCR. Based on the first-in-human RSV B characterisation study and recent elderly RSV A challenge data, we anticipate approximately 74% attack rate, with a range of mild-moderate symptoms in the infected individuals. Symptoms typically commence 3 days post-inoculation and worsen to peak around days 5-9 before rapidly resolving without treatment. Timing of viral shedding is expected to correlate closely with symptoms.

A Phase 2 Study to Investigate the Efficacy and Safety of Zelicapavir in Participants Aged ≥28 Days to ≤36 Months of Age Infected With Respiratory Syncytial Virus

Zelicapavir is a novel, orally administered, nonfusion replication inhibitor of RSV. It is being investigated in this Phase 2 study (EDP 938-203) as a potential treatment for RSV infection in both hospitalized and non-hospitalized children aged ≥28 days to ≤36 months who present with symptomatic RSV infection.

The Role of Vitamin D and Vitamin D Receptor in Recurrent Wheezing in Children With Bronchiolitis: Immunological Association With T-lymphocyte Mitochondrial Mass

A prospective study will be conducted involving children under 2 years of age hospitalized for bronchiolitis during the period 2025-2026. Serum levels of 25-OH vitamin D (by chemiluminescence assay), VDR gene polymorphisms (through molecular techniques), and mitochondrial mass of T lymphocytes (by flow cytometry), will be determined in patients at the acute phase of bronchiolitis and in healthy controls. The children will be followed-up for 36 months, with systematic documentation of wheezing episodes and the prognostic value of the biomarkers mentioned above for the later development of recurrent wheezing will be assessed. This study aims to explore the associations between vitamin D levels, VDR polymorphisms and T-cell mitochondrial mass with bronchiolitis severity and the subsequent risk of wheezing episodes. It is hoped that predictive biomarkers for wheezing risk following bronchiolitis and potential therapeutic targets will be identified.

Vaccine Effectiveness of a Bivalent RSV Prefusion F Protein-Based Vaccine for Preventing RSV Hospitalizations in Adults

The purpose of this pragmatic randomized trial is to evaluate the vaccine effectiveness of bivalent RSV prefusion F vaccine (RSV vaccine) in adults. Participants will be randomized 1:1 to either RSV vaccine or no RSV vaccine.

RSV Vaccination to Reduce Recurrent AECOPD

Objectives: To determine whether respiratory syncytial virus (RSV) vaccination reduces the rate of all-cause moderate-to-severe acute exacerbations of COPD (AECOPD) in high-risk patients, and to characterise RSV-specific infection and immune responses in this population. Hypothesis: RSV vaccination in COPD frequent exacerbators receiving dual long-acting bronchodilators will reduce all-cause moderate-to-severe AECOPD by at least 20-25% over 12 months. Design and subjects: This multicentre, two-arm, open-label, prospective study will recruit 320 COPD patients with 2 moderate or severe AECOPD in the prior year despite dual long-acting bronchodilator therapy. Eligible subjects will be allocated 1:1 to receive RSV vaccination plus standard care or standard care alone and followed for 12 months. Interventions: Participants in the vaccine arm will receive a single dose of a licensed RSV vaccine in addition to usual COPD management. Controls will receive usual care without RSV vaccination during the study period. Main outcome measures: The primary outcome is the rate of all-cause moderate-to-severe AECOPD per patient-year. Secondary outcomes include RSV-positive AECOPD, RSV infection incidence confirmed by virological testing, severe AECOPD requiring hospitalisation, time to first moderate-to-severe AECOPD, and changes in plasma RSV-specific antibody titres over 12 months. Data analysis and expected results: Exacerbation rates will be compared between groups using negative binomial regression with adjustment for key covariates on an intention-to-treat basis. The investigators expect RSV vaccination to achieve a clinically meaningful (20%) reduction in all-cause moderate-to-severe AECOPD and to provide mechanistic insights linking RSV immunity, RSV infection, and exacerbation risk in COPD frequent exacerbators.

Study to Evaluate the Safety of a Lyophilized RSV mRNA Vaccine

To evaluate the safety of Sinovac RSV mRNA among participants aged ≥18 years

Preparedness Through Respiratory Virus Epidemiology and Community Engagement

The CHARM network will be established through three primary institutions-Beth Israel Deaconess Medical Center (BIDMC), the University of California San Diego (UCSD), and the University of Washington (UW)-along with their subcontracting institutions. At UCSD and partner sites, the CHARM network will be implemented via the PREVENT project. All PREVENT participants will be consented in to Component A0 (Community Testing) and a subset of A0 participants will be invited to participate and will be consented into the other components: Component A (Ongoing Testing); Component A Sub-study (Immunology); Component B (Household Transmission). Component A0 participants (Community testing) will be members of the community who are interested in accessing testing for respiratory infections and will be asked to provide limited information that will then be used for screening for study Components A and/or B. Participants in Component A (Ongoing Testing ) will undergo weekly symptom screening. If they report symptoms, they will be asked to provide a nasal swab and complete illness questionnaires on the day they report symptoms (Day 0) and again on Days 7 and 14. Participants in Component A Sub-study (Immunology) will provide blood and saliva/nasal fluid samples twice a year, as well as before and after infection and/or immunization against priority pathogens. Participants in Component B (Household Transmission) will complete daily symptom questionnaires and nasal swabs for 14 days following enrollment, regardless of symptoms. Those who are symptomatic at enrollment will also complete retrospective daily diaries from symptom onset to the enrollment date. Additionally, they provide blood and/or saliva/nasal fluid samples at enrollment and again 28 days later. For all Components, UCSD will provide PCR test results for SARS-CoV-2, Influenza A/B, and RSV for nasal swab samples.

Clinical Validation of the Aptitude Medical Systems Metrix Respiratory Panel Test in At-Home/Non-Laboratory Settings

The Metrix Respiratory Panel Test will be evaluated for use in Non-Laboratory settings in a home testing environment utilizing the clinical study design described herein. The study will take place in simulated home environments which will be set up within or near active clinical settings (e.g., urgent care facilities). This will be a prospective study conducted at three or more investigational sites located within the United States for the clinical validation of the Metrix Respiratory Panel Test for the detection of SARS-CoV-2, Influenza A, Influenza B, Respiratory syncytial virus, and Rhinovirus in anterior nares (AN) swab samples. Additional sites may be added to the study in order to meet minimum subject/sample enrollment requirements and geographic prevalence of respiratory virus infections. Comparator testing will be performed to determine the infection status of each sample for comparison to results generated by the candidate test. The primary comparator for the study will be an FDA-cleared assay for the detection of SARS-CoV-2, Influenza A, Influenza B, Respiratory Syncytial Virus, and Rhinovirus.

A Multi-Site Clinical Evaluation of the LIAISON NES FLU A/B, RSV & COVID-19 Assay in Symptomatic Patients

The DiaSorin Molecular LIAISON® NES FLU A/B, RSV \& COVID-19 real-time polymerase chain reaction (RT-PCR) assay is intended for use on the DiaSorin LIAISON® NES instrument for the in-vitro qualitative detection and differentiation of nucleic acid from influenza A, influenza B, RSV and SARS-CoV-2 virus from dry nasal swabs (NS) from human patients with signs and symptoms during the acute phase of respiratory tract infection in conjunction with clinical and epidemiological risk factors. The LIAISON® NES FLU A/B, RSV \& COVID-19 assay is intended for use as an aid in the differential diagnosis of influenza A, influenza B, RSV and SARS-CoV-2 infection in a professional laboratory setting. Negative results do not preclude influenza A, influenza B, RSV or SARS-CoV-2, infection and should not be used as the sole basis for patient management decisions. The assay is not intended to detect the presence of the influenza C virus.

Effectiveness And Impact Of Nirsevimab In Chile (NIRSE-CL)

The Nirse-CL study is a collaborative effort between the Ministry of Health of Chile, Instituto Sistemas Complejos de Ingeniería (ISCI), and the Faculty of Medicine of the University of Chile. The primary aim is to determine the effectiveness of the monoclonal antibody nirsevimab in preventing RSV infection in infants based on the integrated analysis of several national databases before, during, and after the implementation of a universal immunization program. The impact of the program on RSV-related health outcomes will also be determined.