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New shingles vaccine CRV-101 takes on shingrix in Head-to-Head trial

NCT ID NCT05304351

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This phase 2 study tests a new shingles vaccine called CRV-101 (amezosvatein) against the current standard, Shingrix, in about 1,500 adults aged 50 and older. The goal is to see if CRV-101 is safer and triggers a strong immune response. Participants receive two shots and are monitored for side effects and antibody levels over 14 months.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
CRV-101 (amezosvatein) vaccine
What this could lead to
If successful, this could lead to a new shingles vaccine that is safer or as effective as Shingrix.
What could go wrong
This is an early phase 2 trial, so results may not confirm effectiveness. Side effects like injection site pain or fatigue are possible.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

1,516 people

The number who actually took part.

Started

Feb 2022

Expected to finish

Mar 2032

An estimate. End dates often move.

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

50 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria Participants are eligible to be included in the study only if all of the following criteria apply: 1. Male and non-pregnant female participant must be ≥50 years of age inclusive, at the time of signing the informed consent. * Arms A, B, C, J, K, L, and M will enroll participants ≥50 years of age * Arms D, E, F, G, H, and I will enroll participants ≥50 to \<70 years of age 2. Participants who are healthy as determined by medical evaluation including comprehensive medical history, comprehensive physical examination, vital signs\*, and screening laboratory tests conducted no more than 30 days prior to first study injection administration (Day 0). • Vital signs within grade 1 on the severity grading scale, excluding temperature, are allowed. If vital sign parameter meets grade 2 criteria, then subject must be excluded. Vital signs may be repeated 3 times after a period of rest as needed if transient abnormal fluctuation is suspected. 3. (Applicable only for arms A through I) Completed an Emergency Use Authorization (EUA) or Conditional Marketing Authorization or licensed initial COVID-19 vaccine series (as applicable) ≥30 days prior to enrollment (i.e., at least 30 days prior to the Day 0 visit). 4. Screening laboratory values \[sodium, potassium, blood urea nitrogen (BUN), Alanine Aminotransferase (ALT), Aspartate Aminotransferase (AST), total bilirubin, alkaline phosphatase, creatinine, random glucose, white blood cell count with differential, hemoglobin, and platelet count\] must be within normal ranges or considered not clinically significant by the PI.\*\* 5. Negative HIV 1/2 antibody, hepatitis B surface antigen (HBsAg), and hepatitis C virus (HCV) antibody at screening. If HIV 1/2 antibody is positive, and confirmation testing is negative the participant may be enrolled. 6. Normal urinalysis or, if abnormal, urinalysis determined to be not clinically significant by the PI at screening.\*\* * Screening laboratory values that are abnormal but are considered abnormal due to an acute illness or process may be repeated once. Careful consideration regarding enrolling subjects with screening lab values meeting grade 2 severity that are considered not clinically significant must be made as there is less room for fluctuations to increase to gr ade 3 (severe) lab events. 7. A female participant is eligible to participate if she is not pregnant or breastfeeding, and one of the following conditions applies: * Is a woman of nonchildbearing potential (WONCBP). OR * Is a woman of childbearing potential (WOCBP) and using an acceptable contraceptive method as defined below during the 30 days prior to Day 0 (i.e., the first study vaccine) and is willing to continue to do so during the study until at least 90 days after the last dose of study vaccine, and agrees not to donate eggs (ova, oocytes) for the purpose of reproduction during this period. The investigator should evaluate the potential for contraceptive method failure (e.g., noncompliance, recently initiated) in relation to the timing of the first dose of study vaccine. * A WOCBP must have a negative serum pregnancy test at screening and a negative urine pregnancy test on the day of each study vaccine (prior to vaccination). If a urine test cannot be confirmed as negative (e.g., an ambiguous result), a serum pregnancy test is required. In such cases, the participant must be excluded from participation if the serum pregnancy result is positive. WONCBP is as defined as * Postmenopausal: A postmenopausal state is defined as least 12 months of spontaneous amenorrhea. * Permanently sterile: Permanent sterilization methods include hysterectomy, bilateral salpingectomy, bilateral tubal occlusion/ligation procedures, bilateral oophorectomy, and successful Essure® placement (permanent, non-surgical, non-hormonal sterilization) with documented radiological confirmation test at least 90 days after the procedure, and still menstruating or \<1 year since of the last menses if menopausal. WOCBP is defined as • Any woman or adolescent who has begun menstruation. Acceptable contraception methods include, but are not limited to, sexual abstinence, monogamous relationship with vasectomized partner who has been vasectomized for 6 months or more prior to the participant receiving study product, barrier methods such as condoms or diaphragms with spermicide or foam, effective intrauterine devices, NuvaRing®, and licensed hormonal methods such as implants, injectables, or oral contraceptives ("the pill"). 8. Capable of understanding and giving signed informed consent, which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol prior to any screening procedures. 9. Willing to abstain from donating whole blood or blood derivatives until after Day 84 visit, and within 60 days prior to each study visit after Day 84. 10. Be able and willing to participate in all study visits and be reachable by telephone or personal contact by the study site personnel. 11. Participants who the investigator believes will comply with the requirements of the protocol (e.g., completion of the diary cards, return for follow-up visits, have regular contact to allow evaluation during the study). 12. Capable of understanding and completing diary card. Arms A, B, and C use electronic diary and require access to web browser. Arms D through M use paper diary Exclusion Criteria Participants are excluded from the study if any of the following criteria apply: 1. History of herpes zoster (shingles). 2. History or presence of acute or chronic illness (including cardiovascular, pulmonary, neurological, hepatic, rheumatic, hematological, metabolic, gastrointestinal, endocrinologic or renal disorders, or uncontrolled hypertension) which in the opinion of the Principal Investigator, may interfere with the evaluation of the safety or immunogenicity of the vaccine. 3. History of autoimmune disease or suspected immunosuppressive or immunodeficient condition resulting from disease (e.g., malignancy, HIV infection) or immunosuppressive/cytotoxic therapy (e.g., medications used during cancer chemotherapy, organ transplantation, or to treat autoimmune disorders) that is likely to affect the immune response to vaccination as determined by the PI. 4. Rash, tattoos, or any other dermatological condition that could adversely affect the vaccine injection site or interfere with its evaluation. 5. Abnormal blood pressure \>150 mm Hg systolic or \>95 mm Hg diastolic prior to first study injection administration (Day 0).\*\*\* \*\*\* If abnormal, BP may be repeated up to 3 times after a rest period of 5 minutes between each measurement. 6. History of significant psychiatric illness (including history of suicidal ideation or attempt) with or without current medication. 7. BMI ≥40kg/m2 at screening (where BMI \>34.9 kg/m2, clinically-significant abnormal serum glucose at screening determined by the PI, or clinically-significant diseases or medical conditions, as determined by the PI, is exclusionary.) 8. Significant underlying illness that in the opinion of the investigator would be expected to prevent completion of the study (e.g., life-threatening disease likely to limit survival to less than 4 years). 9. Acute disease and/or fever at the time of enrollment (Day 0). 1. Fever is defined as body temperature ≥38 °C (100.4 °F); oral acquisition will be the preferred route for recording temperature throughout this study. 2. Participants with a minor illness (such as mild diarrhea or mild upper respiratory infection) without fever may be enrolled after resolution of the minor illness, at the discretion of the investigator. 10. Immunized with a vaccine against herpes zoster (Zostavax®, Shingrix®, other licensed or investigational HZ vaccine). 11. Prior varicella vaccination at any time. 12. Received any vaccine within 30 days prior to enrollment (Day 0) or received any non-investigational immunizations while on study except for seasonal influenza, pneumococcal vaccines, other vaccines per the ACIP recommendations, or any licensed or emergency use authorization or conditional marketing authorized COVID-19 booster. Administration of these immunizations must not occur until 30 days after the final study vaccination and completion of the Day 84 immunology blood draw and must not occur within the 30 days prior to each on-study immunology blood draw after Day 84. Receipt of any VZV vaccine is prohibited on the study. 13. Use of any medication that, in the opinion of the Principal Investigator, may interfere with the evaluation of the safety or immunogenicity of the vaccine. 14. (a) Chronic administration (defined as more than 14 days in total) of immunosuppressants or other immune-modifying drugs (e.g., oral or injected steroids, such as prednisone; high-dose inhaled steroids; biologics (e.g., tumor necrosis factor \[TNF\] inhibitor, or other cytokine inhibitors within 14 days of Day 0 through Day 84, and within 14 days of each on study immunogenicity blood draw after Day 84; Exclusionary corticosteroid administration is defined as prednisone \>20 mg/day (or equivalent) for any frequency; low-dose inhaled and topical and ocular steroids are allowed; (b) or cytotoxic therapies, such as chemotherapy drugs or radiation, from 180 days prior to enrollment, during the study through Day 421. Participants who meet this criterion from 14a and 14b after Day 56, should continue to be followed for safety and immunogenicity but will not be in included in the per protocol population from the date of meeting the criterion. 15. Received a blood transfusion, platelets, plasma, or immunoglobulin 90 days prior to first dose of study vaccine (Day 0) or planned administration of such products during the study. 16. Donated blood products (platelets, whole blood, plasma, etc.) within 60 days prior to enrollment (Day 0). 17. Participation in another experimental protocol which includes the receipt of any investigational products/vaccines or devices within 90 days prior to enrollment (Day 0) in this study, or planned participation in another experimental protocol which includes investigational product/vaccine or device receipt during the study period through D421\*. After the D421 visit, participation in another clinical study and with concurrent receipt of another experimental investigational product/vaccine or device is allowed with medical monitor approval. Any other investigational product/vaccine with immune modulating effect which would complicate the assessment of humoral and cellular responses, including investigational vaccines, must not be used 60 days prior to each LTFU extension year visit. Receipt of another experimental VZV vaccine or HSV vaccine is prohibited on the study. \*Prior to Day 421, concurrent participation in a study which previously included investigational product/vaccine receipt but is no longer receiving investigational products/vaccine, such as in an observational phase of the other study, is allowed. 18. History of previous anaphylaxis or severe allergic reaction to vaccines or sensitivity to any of the study vaccines, or components thereof, or drug or other allergy that, in the opinion of the investigator, contraindicates participation in the study. 19. Known or suspected alcohol or drug abuse within 5 years prior to enrollment (Day 0). 20. ≥20 pack-years for a current smoker or a former smoker at screening. 21. Unlikely to cooperate with the requirements of the study protocol, or deemed unreliable in attending study visits, or otherwise determined by the investigator not to be a good candidate to participate in this study. \[protocol v8.0\]

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Conditions

The condition(s) this trial relates to.

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Contacts and locations

Locations

  • Curevo Investigational Site

    Tempe, Arizona, 85281, United States

  • Curevo Investigational Site

    Coral Gables, Florida, 33134, United States

  • Curevo Investigational Site

    Tampa, Florida, 33616, United States

  • Curevo Investigational Site

    Oak Brook, Illinois, 60523, United States

  • Curevo Investigational Site

    Lenexa, Kansas, 66219, United States

  • Curevo Investigational Site

    Newton, Kansas, 67114, United States

  • Curevo Investigational Site

    Lexington, Kentucky, 40509, United States

  • Curevo Investigational Site

    Las Vegas, Nevada, 89119, United States

  • Curevo Investigational Site

    Edmond, Oklahoma, 73013, United States

  • Curevo Investigational Site

    Knoxville, Tennessee, 37909, United States

  • Curevo Investigational Site

    Austin, Texas, 78745, United States

  • Curevo Investigational Site

    Dallas, Texas, 75251, United States

  • Curevo Investigational Site

    Euless, Texas, 76040, United States

  • Curevo Investigational Site

    Salt Lake City, Utah, 84107, United States

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