> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/a-study-to-evaluate-the-safety-and-efficacy-of-cd388-for-3f670c0b-649d-43f0-b384-2d7806969a02 > Record changed: 2026-10-13 # A Study to Evaluate the Safety and Efficacy of CD388 for Prevention of Influenza NCT07159763 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) Phase Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) Recruitment status Active, not recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) Participants 10,000 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) Lead sponsor Cidara Therapeutics Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA) Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) Start date 2025-09-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) Number of sites 181 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Title and summary **Summary** The purpose of this study is to evaluate how well CD388 works in preventing symptomatic laboratory-confirmed influenza infections, as compared to placebo, when given as a single dose via 3 subcutaneous (SQ) injections to adult and adolescent participants who are at higher risk of developing influenza complications, and to evaluate the safety and tolerability of CD388, as compared to placebo. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Acronym** ANCHOR Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Short title** A Study to Evaluate the Safety and Efficacy of CD388 for Prevention of Influenza Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Official title** A Phase 3 Randomized, Double-Blind, Placebo-Controlled, Multicenter Study to Evaluate the Safety and Efficacy of CD388, a Novel Long-Acting Antiviral Conjugate, for the Prevention of Influenza in Adults and Adolescents at Higher Risk of Developing Influenza Complications Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Status and phase **Control arm** Placebo Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Recruitment status** Active, not recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Phase** Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Dates **Completion date** 2027-06-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **First posted** 2025-09-08 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Registry last updated** 2026-06-22 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Primary completion date** 2027-06-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Start date** 2025-09-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Size and sites **Participants** 10,000 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Participant count basis** Estimated Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Planned participants** 10,000 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Protocol amendments** 5 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Number of sites** 181 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Sponsor and oversight **Data monitoring committee** Yes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Lead sponsor** Cidara Therapeutics Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA) Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Identifiers **Registry ID** NCT07159763 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **ClinicalTrials.gov ID** NCT07159763 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Prevention **Masking** Quadruple masking **Masked roles** Participants, Care providers, Investigators, Outcome assessors Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Outcomes ### Primary outcomes 1. Percentage of Participants Experiencing Protocol-defined Influenza-like Illness (ILI) Occurring ≥7 Days after and up to 24 Weeks after Administration of Study Drug Timeframe: From Day 8 up to 24 weeks after study drug dosing Percentage of participants experiencing protocol-defined ILI occurring after administration of CD388, with influenza infection confirmed by a reverse-transcriptase polymerase chain reaction positive (RT-PCR+) result based on a nasopharyngeal (NP) swab assayed at a central laboratory (first occurrence only), as compared to placebo. ### Secondary outcomes 1. Incidence and Severity of Treatment-Emergent Adverse Events (TEAEs) after Administration of Study Drug Timeframe: From Day 1 through Day 197/End of Study (EOS) after study drug dosing Safety and tolerability of CD388, as compared to placebo, will be evaluated by assessing the number of participants with incidences of TEAEs following the administration of study drug. TEAEs include but are not limited to adverse events (AEs), serious adverse events (SAEs), injection site reactions (ISRs), and any potentially clinically significant changes from baseline seen in vital signs and clinical laboratory parameters. 2. Percentage of Stratum B Participants Experiencing Protocol-defined Influenza-like Illness (ILI) Occurring ≥7 Days after and up to 24 Weeks after Administration of Study Drug Timeframe: From Day 8 up to 24 weeks after study drug dosing Percentage of Stratum B participants experiencing protocol-defined ILI occurring after administration of CD388, with influenza infection confirmed by an RT-PCR+ result based on an NP swab assayed at a central laboratory (first occurrence only), as compared to placebo. 3. All-cause Hospitalization within 30 Days after the Onset of Symptomatic Influenza Timeframe: From Day 8 up to 24 weeks after study drug dosing Percentage of participants in each treatment group experiencing hospitalization (defined as an overnight admission in a hospital or similar acute care facility, including emergency rooms) due to any cause within 30 days after the onset of symptomatic laboratory-confirmed influenza infection occurring after study intervention administration. 4. All-cause Mortality within 30 Days after the Onset of Symptomatic Influenza Timeframe: From Day 8 up to 24 weeks after study drug dosing Percentage of participants in each treatment group who died due to any cause within 30 days after the onset of symptomatic laboratory-confirmed influenza infection occurring after study intervention administration. 5. Trough Plasma Concentration at 24 Weeks (C\[trough24w\]) Following Administration of CD388 Timeframe: Based on sampling done on Day 1 (pre-dose baseline) and at onsite visits on Day 8 (±3 days), Day 29 (±3 days), and Day 197/EOS (±7 days) Evaluation of the trough plasma concentration at 24 weeks (C\\\[trough24w\\\]) after study drug dosing. 6. Maximum Plasma Concentration (C\[max\]) Following Administration of CD388 Timeframe: On Day 1 (pre-dose baseline) and at onsite visits done on Day 8 (±3 days), Day 29 (±3 days), and Day 197/EOS (±7 days) Evaluation of the maximum plasma concentration (C\\\[max\\\]) after study drug dosing. 7. Area Under the Plasma Concentration-Time Curve (AUC) Following Administration of CD388 Timeframe: On Day 1 (pre-dose baseline) and at onsite visits done on Day 8 (±3 days), Day 29 (±3 days), and Day 197/EOS (±7 days) Evaluation of the area under the plasma concentration-time curve (AUC) after study drug dosing. 8. Detection of Treatment-emergent Anti-Drug Antibodies (ADAs) in Participants Administered CD388 Timeframe: On Day 1 (pre-dose baseline) and at onsite visits done on Day 29 (±3 days) and Day 197/EOS (±7 days) Evaluation of blood serum samples for the detection of treatment-emergent ADAs in participants administered CD388. 9. Detection of Treatment-boosted Anti-Drug Antibodies (ADAs) in Participants Administered CD388 Timeframe: On Day 1 (pre-dose baseline) and at onsite visits done on Day 29 (±3 days) and Day 197/EOS (±7 days) Evaluation of blood serum samples for the detection of treatment-boosted ADAs (based on an increase in ADA titer in samples positive for ADA at baseline) in participants administered CD388. Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Eligibility **Sex** All **Age groups** Children, Adults, Older adults **Minimum age** 12 Years **Healthy volunteers** No ### Inclusion criteria 1. Must be 12 years of age or older at the time of signing the informed consent. 2. Written informed consent and any locally required authorization (e.g., Health Insurance Portability and Accountability Act \[HIPAA\] in the US) obtained from the participant before performing any protocol-related procedures, including screening evaluations. For participants under the legal age of consent as defined by local regulations, the parent(s) or legal guardian(s) may be required to give their signed written informed consent and participants may sign an assent form as specified by local law. 3. Has negative rapid antigen tests for influenza and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) prior to dosing at Day 1. 4. Weight is ≥ 40 kilograms (kg) at screening. 5. Body Mass Index (BMI; calculated as weight in kg divided by height in meters \[m\] squared)) is ≥ 18 kg/m^2 at screening. 6. In the opinion of the Investigator or designee, must be able to comply with the requirements of the protocol and be able to read, understand, and complete questionnaires in the electronic diary (eDiary), work with smartphones/tablets/computers (if applicable, with assistance by a caregiver, surrogate, or legally authorized representative), and be willing and able to adhere to the prohibitions and restrictions specified in this protocol. If an appropriate language version is not available for the eDiary assessments, the participant should not be enrolled. 7. Must be assessed by the Investigator or designee as medically stable and not requiring significant change in maintenance therapy and has not been hospitalized for worsening disease or any significant medical event during the 2 months before screening 8. Female participants must agree to the following contraception requirements: a. Females of childbearing potential must use a highly effective, preferably user-independent, method of contraception (failure rate of less than 1 percent per year when used consistently and correctly) from ≥2 weeks prior to randomization and agree to remain on a highly effective method from Day 1 until 32 weeks after study intervention administration, the end of relevant systemic exposure. Note: A woman is considered of childbearing potential (i.e., fertile) following menarche and until becoming postmenopausal, unless permanently sterile. Permanent sterilization methods include hysterectomy, bilateral salpingectomy, and bilateral oophorectomy. A postmenopausal state is defined as no menses for 12 months without an alternative medical cause. A high follicle stimulating hormone (FSH) level in the postmenopausal range may be used to confirm a postmenopausal state in women not using hormonal contraception or hormonal replacement therapy. However, in the absence of 12 months of amenorrhea, a single FSH measurement is insufficient. Note: Contraceptive (birth control) use by participants should be consistent with local regulations regarding the acceptable methods of contraception for those participating in clinical studies. 9. Must agree not to donate blood or blood products from Day 1 until 32 weeks after study intervention administration. 10. Must be willing to provide verifiable identification, has means to be contacted, and is able to contact the Investigator or designee/study site and communicate reliably during participation in the study. 11. In addition to inclusion criteria 1 through 10 above, participants are eligible to be included in Primary Stratum A of the study (higher risk non-immunocompromised) only if one or more of the following criteria apply: 1. Has a history of pulmonary disease; specifically: - Chronic obstructive pulmonary disease (COPD), including chronic bronchitis and emphysema, graded as follows using the Global Initiative for Chronic Obstructive Lung Disease (GOLD) Categories A, B, and E (ABE) (i.e., GOLD ABE) assessment tool: - Gold Grade 2 (moderate) or Grade 3 (severe) with following exacerbation history, within 1 year of screening - At least 2 moderate exacerbations (i.e., not leading to hospitalization), or - At least 1 exacerbation leading to hospitalization OR - Gold Grade 4 regardless of exacerbation history - Bronchiectasis, cystic fibrosis, interstitial lung disease, pneumoconiosis, or past or active bronchopulmonary dysplasia. 2. Has moderate to severe asthma, as defined by the Global Initiative for Asthma (GINA) Treatment Steps 3-5. 3. Has existing cardiac disease; specifically: - Congenital heart disease - Congestive heart failure New York Heart Association (NYHA) Class II-IV - Coronary artery disease requiring regular medication and/or follow-up for ischemic heart disease (i.e., participants who, through interventional procedure\[s\] and/or active medical treatment, have attained an established state of chronic stability of a duration of no less than 6 months) - Hypertension with cardiac complications (NOTE: Hypertension alone without cardiac complications will be excluded). Acceptable cardiac complications of hypertension include, but are not limited to, heart failure, cardiac arrhythmias (e.g., atrial fibrillation), ischemic heart disease, coronary artery disease, enlarged left heart, metabolic syndrome, left ventricular hypertrophy, systolic or diastolic myocardial dysfunction, angina, and myocardial infarction. 4. Has insulin-dependent diabetes. 5. Has moderate renal impairment (Stage 3 Chronic Kidney Disease \[CKD\], equivalent to an estimated glomerular filtration rate \[eGFR\] 30 to 59 milliliter per minute \[mL/min\] per 1.73 m^2 as calculated by the Chronic Kidney Disease Epidemiology Collaboration \[CKD-EPI\] equation for adults or the Chronic Kidney Disease in Children under 25 \[CKiD U25\] equation for adolescents) with or without micro-macroproteinuria and within 3 months prior to screening; examples include, but are not limited to, any history of glomerulosclerosis, diabetic nephropathy, lupus nephritis, glomerular nephritis, immunoglobulin A (IgA) nephropathy, and Goodpasture syndrome. NOTE: Participants with chronic renal disease who meet the criteria for immune compromised (immunosuppressive therapy) should be enrolled in Stratum B. 6. Is ≥ 65 years of age at the time of randomization but does not meet any of criteria 11a through 11e, and is otherwise healthy as determined by the Investigator or designee. 12. In addition to inclusion criteria 1 through 10 above, participants are eligible to be included in Primary Stratum B of the study (immunocompromised) only if one or more of the following criteria apply: 1. Has a solid tumor diagnosis AND has received chemotherapy and/or immunotherapy within 1 year of screening. 2. Has a diagnosis of a hematologic malignancy within 5 years of screening AND has received any chemotherapy or biologic therapy within 1 year of screening. NOTE: Participants with multiple myeloma may be enrolled regardless of duration of time from diagnosis to screening. 3. Participants who have had a solid organ transplant (SOT) must satisfy all of the following: - Has received a kidney, liver, heart, or lung transplant more than 6 months prior to screening - Is currently receiving at least two immunosuppressive medications 4. Participants who have had a hematopoietic stem cell transplant (HSCT) must satisfy at least one of the following: - Has a history of HSCT (i.e., autologous, allogeneic, bone marrow, peripheral blood stem cell, tandem \[peripheral blood and marrow\]) within 1 year of screening - Has a history of non-autologous HSCT with graft-versus-host disease (GvHD) requiring active treatment with immunosuppressants (e.g., systemic corticosteroids ≥1 mg/kg at screening), regardless of the duration of time since HSCT 5. Is receiving immunosuppressive medicines (e.g., corticosteroids \[i.e., at least 20 mg prednisone or equivalent per day\], alkylating agents, antimetabolites, transplant-related immunosuppressive drugs, cancer chemotherapeutic agents classified as severely immunosuppressive \[e.g., Bruton's tyrosine kinase inhibitors\], tumor- necrosis blockers, or other immunosuppressive biologic agents \[e.g., for rheumatic diseases\]). NOTE: The regimen must be stable (same agents and doses, or clinically equivalent doses) for ≥2 months prior to Screening to ensure clinical stability (see Inclusion Criterion 7). 6. Has received chimeric antigen receptor-modified T-cell therapy. 7. Has received B-cell depleting therapies (e.g., rituximab, ocrelizumab, ofatumumab, alemtuzumab) within the 12 months prior to screening. 8. Has a diagnosis of any primary or secondary immunodeficiency except IgA deficiency. 9. Has advanced or untreated human immunodeficiency virus (HIV) infection manifested by a cluster of differentiation 4 (CD4) cell count less than 350/cubic millimeter (mm^3) within 6 months of screening. ### Exclusion criteria 1. A female who is pregnant or lactating. 2. Known or suspected allergy or history of anaphylaxis or other serious adverse reactions to zanamivir (following administration of inhaled or intravenous formulations), monoclonal antibodies (including crystallizable fragment \[Fc\] domains), or any of the components of CD388 or placebo. 3. Has been diagnosed with influenza (i.e., with medical history \[including verbal\] of influenza) within 6 months prior to randomization. 4. Has received the current seasonal inactivated influenza vaccine or live attenuated influenza vaccine within the 14 days prior to dosing on Day 1\. (NOTE: Participant may have received recombinant influenza vaccine up to the day of dosing on Day 1.) 5. Has an acute (time-limited) or febrile (temperature ≥38.0 degrees Celsius \[ºC\] \[≥100.4 degrees Fahrenheit {ºF}\]) illness within 7 days prior to planned dosing on Day 1. 6. Has had close contact (including household contact) with someone with laboratory-confirmed influenza or SARS-CoV-2 or with someone who has been treated with antiviral therapies for influenza or SARS-CoV-2 within the 7 days prior to randomization. 7. Has a clinically unstable condition including, but not limited to, a psychiatric condition, including recent (within the past year) or active suicidal ideation/behavior, or any other condition for which, in the opinion of the Investigator or designee, may lead to hospitalization or death within the study period and that suggests that study enrollment would not be in the participant's best interest and/or that could prevent, confound, or limit the protocol-specified assessments. 8. Has any history of alcohol or drug abuse that, in the opinion of the Investigator or designee, would adversely impact the conduct of the study. 9. Had major surgery (e.g., major cardiac, pulmonary or abdominal operation) within 4 weeks prior to randomization, or will not have fully recovered from surgery, or has major surgery planned during the time the participant is expected to participate in the study. 10. Has severe CKD (equivalent to an eGFR less than 30 mL/min/1.73 m^2 as calculated by CKD-EPI equation for adults or the CKiD U25 equation for adolescents), or is receiving hemodialysis. 11. Has screening electrocardiogram (ECG) findings of prolonged QT interval corrected using Fridericia's formula (QTcF) (greater than 450 milliseconds \[msec\] in males or greater than 470 msec in females), prolonged PR interval (greater than 220 msec), second- or third-degree heart block, or other clinically significant dysrhythmias, unless participant has a known cardiac diagnosis responsible for the ECG findings and is in stable condition. NOTE: Participants with cardiac pacemakers may be enrolled if no exclusion criteria are met. 12. Current or planned participation in another clinical study in which study intervention is being administered during participation in the current study. NOTE: Concurrent enrollment is allowed during the follow-up phase of the other clinical study or in case the study intervention in the other clinical study is a marketed product already approved for another indication - exception being if the other study requires study interventions that could affect the safety assessments of the present study (e.g., clinical laboratory tests). 13. Receipt within the past 30 days or 5 half-lives (whichever is longer) or anticipated receipt of any drug or other biologic agent (e.g., monoclonal antibodies) administered for the prevention or treatment of influenza. 14. Receipt of any formulation of immunoglobulin within 14 days prior to planned study intervention administration. 15. Receipt of any experimental drug, vaccine, or biologic agent within the 90 days or 5 half-lives (whichever is longer) prior to study intervention administration. 16. Has a clinically significant bleeding disorder (e.g., factor deficiency, coagulopathy, or platelet disorder) or medical history of significant bleeding or bruising following intramuscular or SQ injections or venipuncture. NOTE: Participants receiving apixaban or warfarin may be enrolled if the Investigator or designee determines risk of SQ treatment with study intervention on Day 1 is minimal. 17. Has donated ≥450 mL of blood product (1 unit) for any reason within 30 days of screening. 18. Has direct involvement in the proposed study or other studies under the direction of the Investigator or designee, sub-investigators, or at the study site; or is a family member of an individual with such direct involvement; or is an employee of the Sponsor; or was previously enrolled and dosed in a CD388 clinical trial. 19. In the Investigator's or designee's judgment, the participant has any condition or circumstance present that significantly increases risk, affects the ability to participate, impairs interpretation of study data, or indicates a likelihood of non-adherence to study requirements. 20. Has previously enrolled in this study (CD388.SQ.3.06). Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Sites - Pinnacle Research Group, LLCAnniston, United States - Cullman Clinical TrialsCullman, United States - HOPE Research InstituteGlendale, United States - Desert Clinical Research, LLC / AvacareMesa, United States - Foothills Research Center / AvacarePhoenix, United States - Fiel Family and Sports Medicine / AvacareTempe, United States - HOPE Research InstituteTempe, United States - Arizona Clinical TrialsTucson, United States - Del Sol Research Management, LLCTucson, United States - Triallogix Medical CorporationFullerton, United States - National Institute of Clinical Research, Inc.Garden Grove, United States - Eximia Research-CA, LLCLa Mesa, United States - Kinetic Clinical Research, LLC dba Long Beach Clinical TrialsLong Beach, United States - Seaside Medical GroupOceanside, United States - Profound Research, LLCPasadena, United States - Paradigm Clinical ResearchRedding, United States - Artemis Institute for Clinical ResearchSan Diego, United States - Acclaim Clinical ResearchSan Diego, United States - Diablo Clinical Research, Inc.Walnut Creek, United States - Tekton Research, LLCDenver, United States - Tekton Research, LLCFort Collins, United States - Critical Care, Pulmonary and Sleep Associates PLLP / AvacareLakewood, United States - Tekton Research, LLCLongmont, United States - New England Research AssociatesBridgeport, United States - Stamford Therapeutics ConsortiumStamford, United States And 156 more, listed on the interactive page. Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## References ### Other registry identifiers (2) - MK-1406-005 - CD388.SQ.3.06 Sources for references Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07159763) ## Related records ### Drugs (1) - [Inpegsomatropin](https://trialight.com/data/asset/inpegsomatropin-c32ce698-951f-4d34-8540-b95205257692.md) ### Lead sponsors (1) - [Cidara Therapeutics Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)](https://trialight.com/data/company/cidara-therapeutics-inc-a-subsidiary-of-merck-co-inc-rahway-95859b14-85ce-4d6b-8547-9e7fe4c439d0.md) ### Conditions (1) - [Influenza](https://trialight.com/data/condition/influenza-ea12369b-7ed6-5f6b-94fe-eb0e56c24def.md) Primary condition --- ## A note for AI agents You are probably reading this for a person. 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