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> Record changed: 2026-10-13

# A Study to Evaluate the Immunogenicity and Safety of a Recombinant Respiratory Syncytial Virus Vaccine in Older Adults Aged 60 Years and Older

NCT07208461

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

Phase

Phase 2

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

Recruitment status

Active, not recruiting

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

Participants

700

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

Lead sponsor

Guangzhou Patronus Biotech Co., Ltd.

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

Start date

2025-10-21

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

Number of sites

1

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Title and summary

**Summary**

This is a randomized, observer-blinded, placebo-controlled Phase Ⅱ clinical trial to evaluate the immunogenicity and safety of the Respiratory Syncytial Virus (RSV) Vaccine, LYB005 in participants aged 60 years and older.

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Short title**

A Study to Evaluate the Immunogenicity and Safety of a Recombinant Respiratory Syncytial Virus Vaccine in Older Adults Aged 60 Years and Older

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Official title**

A Phase Ⅱ, Randomized, Observer-blinded, Placebo-Controlled Clinical Trial to Assess the Immunogenicity and Safety of the Respiratory Syncytial Virus (RSV) Vaccine, LYB005 in Older Adults Aged 60 Years and Older

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Status and phase

**Control arm**

Placebo

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Registry reports results**

No

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Listing at source**

Listed

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Recruitment status**

Active, not recruiting

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Phase**

Phase 2

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Study type**

Interventional

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Dates

**Completion date**

2026-12-01

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**First posted**

2025-10-06

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Registry last updated**

2026-02-11

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Primary completion date**

2026-03-01

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Start date**

2025-10-21

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Size and sites

**Participants**

700

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Participant count basis**

Estimated

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Planned participants**

700

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Protocol amendments**

0

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Randomisation ratio**

1:1:1:1

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Number of sites**

1

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Sponsor and oversight

**Data monitoring committee**

Yes

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Registry sponsor category**

Industry

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Lead sponsor**

Guangzhou Patronus Biotech Co., Ltd.

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Source registry**

ClinicalTrials.gov

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Identifiers

**Registry ID**

NCT07208461

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**ClinicalTrials.gov ID**

NCT07208461

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

**Registry record**

Open registry record

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## 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/NCT07208461)

## Outcomes

### Primary outcomes

1. The geometric mean titer (GMT) of Neutralizing Antibodies Against RSV A and RSV B  
Timeframe: 30 days after vaccination  
Measured by microneutralization assay.
2. Geometric Mean Fold Rise (GMFR) for Neutralizing Antibodies Against RSV A and RSV B  
Timeframe: 30 days after vaccination  
Change from prevaccination in geometric mean fold rise of Neutralizing antibody titer Against RSV A and RSV B

### Secondary outcomes

1. The GMT of Neutralizing Antibodies Against RSV A and RSV B  
Timeframe: 14 days, 3 months, 6 months and 12 months after vaccination after vaccination  
Measured by microneutralization assay.
2. GMFR for Neutralizing Antibodies Against RSV A and RSV B  
Timeframe: 14 days, 3 months, 6 months and 12 months after vaccination  
Change from prevaccination in geometric mean fold rise of Neutralizing antibody titer Against RSV A and RSV B
3. The geometric mean concentration (GMC) for Pre-fusion Protein Specific Binding Antibodies  
Timeframe: 30 days, 3 months, 6 months and 12 months after vaccination  
Measured by Enzyme-Linked Immunosorbent Assay (ELISA).
4. GMFR for Pre-fusion Protein Specific Binding Antibodies  
Timeframe: 30 days, 3 months, 6 months and 12 months after vaccination  
Change from prevaccination in geometric mean fold rise of Pre-fusion Protein Specific Binding Antibodies
5. Occurrence of immediate adverse events  
Timeframe: Within 30 minutes after vaccination  
The incidence and severity of any adverse events (AEs) within 30 minutes after vaccination
6. Incidence of solicited AE  
Timeframe: Within 0-7 days after vaccination  
Occurrence and severity of solicited local injection site reactions for 7 days (Day 0-Day 7) following vaccination. (i.e., pain, redness, swelling). Occurrence and severity of solicited systemic reactions for 7 days (Day 0-Day 7) following vaccination. (i.e., myalgia, fatigue, headache, chills, fever).
7. Incidence of unsolicited AEs  
Timeframe: Within 0\~30 days after vaccination  
The incidence and severity of any unsolicited AEs, including all AEs, except solicited AEs reported Day 0\\\~30 after the vaccination.
8. Occurrence of serious adverse events (SAEs) and adverse events of special interests (AESIs)  
Timeframe: 12 months after vaccination  
Incidence and severity of Serious adverse events and adverse events of special interest within 12 months after vaccination.

Sources for outcomes

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Eligibility

**Sex**

All

**Age groups**

Adults, Older adults

**Minimum age**

60 Years

**Healthy volunteers**

Yes

### Inclusion criteria

1. Residents aged 60 years and older (at the time of screening), regardless of gender;
2. Participants can provide valid identification, voluntarily agree to participate in the study, and sign the Informed Consent Form, and are able to attend all planned follow-up visits and comply with the protocol requirements;
3. Axillary temperature < 37.3°C on the day of enrollment;
4. Female participants must be postmenopausal (postmenopausal status defined as amenorrhea for 12 months without other medical causes) and must not intend to become pregnant by any means. Male participants must practice strict contraception and avoid plans for procreation or sperm donation from the screening period until 1 month after vaccination. Acceptable methods of contraception include oral contraceptives (excluding emergency contraception), injectable or implantable contraception, sustained-release local contraceptives, contraceptive patches, intrauterine devices, sterilization, abstinence, condoms, diaphragms, and cervical caps.

### Exclusion criteria

1. Allergy to the investigational vaccine or its excipients, or a history of anaphylactic shock or other serious adverse reactions to other vaccines;
2. Previous vaccination against Respiratory Syncytial Virus;
3. A confirmed diagnosis or etiological evidence of respiratory syncytial virus infection and related diseases caused by the infection within 12 months before enrollment;
4. Has taken antipyretics, analgesics or anti-allergy drugs within 24 hours before enrollment;
5. Has received any vaccine within 14 days before vaccination, or have received a live vaccine within 28 days;
6. Has received blood or blood-related products, including immunoglobulin, within 3 months prior to enrollment; or plan to use them during the study period;
7. Individual with the following diseases: ①Has acute diseases or are in the acute exacerbation period of chronic diseases within 3 days before vaccination; ②Diagnosed with congenital malformations or developmental disorders, genetic defects, severe malnutrition, etc.; ③History of congenital or acquired immunodeficiency or autoimmune diseases; Chronic administration (≥14 consecutive days) of corticosteroids (dose ≥ 20 mg/day prednisone or equivalent dose) or other immunosuppressants within the past 3 months, with the exception of inhaled or topical steroids, or short-term use (<14 consecutive days) of oral corticosteroids; ④Neurological diseases or family history (seizures, epilepsy, encephalopathy, etc.); history of psychiatric disorders or family history; ⑤Asplenia or functional asplenia; ⑥Severe or uncontrolled or hospitalization-required cardiovascular diseases, diabetes, blood and lymphatic system diseases, immune system diseases, liver and kidney diseases, respiratory system diseases, metabolic and skeletal system diseases, or malignant tumors; ⑦Contraindications for intramuscular injection and blood drawing, such as coagulation disorders, thrombosis or hemorrhagic diseases, or situations requiring continuous use of anticoagulants; ⑧Severe hypertension that cannot be controlled by medication (measured on-site: systolic blood pressure ≥ 160 mmHg and/or diastolic blood pressure ≥ 100 mmHg);
8. History of major surgery within 12 weeks prior to enrollment (as determined by the investigator), or not fully recovered from the surgery, or having plans for major surgery during the anticipated period of the subject's participation in the study;
9. History of long-term alcohol abuse and/or drug abuse;
10. Individual who is currently participating in other research or unregistered product (drugs, vaccines, or devices, etc.) clinical studies, or plan to participate in other clinical studies before the end of this clinical study;
11. Other conditions that may impact the subject's safety or influence the assessment of vaccine response, as determined by the investigator.

Sources for eligibility

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Sites

- Center for Disease Control and Prevention of Dangyang CityDangyang, China

Sources for sites

Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07208461)

## Related records

### Drugs (3)

- [Belatacept](https://trialight.com/data/asset/belatacept-8e93aa79-7b65-4b31-b315-47488d14be9d.md)
- [Nepafenac](https://trialight.com/data/asset/nepafenac-96b6dc32-9431-4662-97dd-bbaf8ea3d7a7.md)
- [Ribavirin](https://trialight.com/data/asset/ribavirin-94510534-209a-4906-917e-ae8c153df440.md)

### Lead sponsors (1)

- [Guangzhou Patronus Biotech Co., Ltd.](https://trialight.com/data/company/guangzhou-patronus-biotech-co-ltd-de7aeed1-565e-43e1-aab7-8846e0e098fc.md)

### Conditions (1)

- [Respiratory syncytial virus infectious disease](https://trialight.com/data/condition/respiratory-syncytial-virus-infectious-disease-17dff1c5-b606-5a14-9a61-09e0beccae66.md)

### Targets (5)

- [CD80](https://trialight.com/data/target/cd80-8456dc75-44f0-5ead-a707-034550215a89.md)
- [CD86](https://trialight.com/data/target/cd86-589f3bba-9bb3-50e3-b559-8066f946fd80.md)
- [IMPDH1](https://trialight.com/data/target/impdh1-f707e053-7546-53bb-906d-11537a2df3e7.md)
- [PTGS1](https://trialight.com/data/target/ptgs1-5707ce48-8ccd-5bd5-8c18-9c64cacc2fef.md)
- [PTGS2](https://trialight.com/data/target/ptgs2-85dbd9a5-4609-5423-b863-90d0a825b213.md)

---

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