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Jynneos

Phase 2

Monkeypox (Mpox) | Monoclonal antibody | Infectious Disease |Icon Plc|Last Updated: Apr 8, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment970

FDA Designations

No designations recorded

Clinical trial landscape

Jynneos · 1 trial · 1 indication

Phase 2 1
NCT07199569Comparability Trial of the MVA-BN Vaccine Manufactured in Different Production CellsMonkeypox (Mpox)
ACTIVE NOT_RECRUITING970 Analytics
PHASE2ACTIVE NOT_RECRUITING
Comparability Trial of the MVA-BN Vaccine Manufactured in Different Production Cells
Monkeypox (Mpox)Unlock trial analytics

Study Endpoints

Primary Endpoints

Immunogenicity of 2 doses of MVA-BN
2 weeks after the second MVA-BN vaccination

Titer of serum neutralizing antibodies against vaccinia virus as measured by plaque reduction neutralization tests (PRNTs)

Number of Participants with Serious Adverse Events (SAE)
From vaccination through study termination, up to 7 months

Number and percentage of study participants reporting any serious adverse events at any time during the trial period

Number of Participants with Adverse Events of Special Interest (AESI)
From vaccination through study termination, up to 7 months

Number and percentage of study participants reporting any Adverse Events of Special Interest (AESI)

Number of Participants with Medically Attended Adverse Events (MAAE)
From vaccination through study termination, up to 7 months

Number and percentage of study participants reporting any Medically Attended Adverse Events (MAAE)

Number of Participants with a Grade 3 or higher adverse event (AE)
The day of or within 28 days after either vaccination

Number and percentage of study participants reporting any grade 3 or higher unsolicited adverse event (AE) assessed as related to trial vaccine

Number of Participants with Solicited Local AE
The day of or within 7 days after either vaccination

Number and percentage of study participants reporting any solicited local AE (pain, swelling, pruritus, erythema, induration)

Number of Participants with Solicited Systemic AE (body temperature, headache, fatigue, myalgia, nausea, chills)
The day of or within 7 days after either vaccination

Number and percentage of study participants reporting any solicited systemic AE (body temperature, headache, fatigue, myalgia, nausea, chills)

Number of Participants with Unsolicited AE
The day of or within 28 days after either vaccination

Number and percentage of study participants reporting any unsolicited AE

Secondary Endpoints

Titer of Serum Neutralizing Antibodies against Vaccinia Virus
4 weeks after the first MVA-BN vaccination and 6 months after the last MVA-BN vaccination
Seroconversion in Neutralizing Antibodies
4 weeks after the first MVA-BN vaccination, 2 weeks and 6 months after the second MVA-BN vaccination
Titer of Total Antibodies against Vaccinia Virus
4 weeks after the first MVA-BN vaccination, 2 weeks and 6 months after the second MVA-BN vaccination
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeOTHER

Treatment Arms

ArmTypeDescription
Group 1ACTIVE_COMPARATORMVA-BN (CEF)
Group 2EXPERIMENTALMVA-BN (Quail)

Interventions

NameTypeDescription
JynneosBIOLOGICALMVA-BN manufactured in primary CEF cells. MVA-BN (CEF) vaccine contains 0.5 × 10E8 to 3.95 × 10E8 Inf.U and is an LF suspension to be administered subcutaneously into the deltoid muscle of the upper arm (preferably the nondominant arm). Participant will receive 2 doses 4 weeks apart (Day 1 and Day 29).
MVA-BN (Quail)BIOLOGICALMVA-BN manufactured in CCX.E10 quail cell line. Vaccine contains 0.5 × 10E8 to 3.95 × 10E8 Inf.U. and is a LF suspension to be administered subcutaneously into the deltoid muscle of the upper arm (preferably the nondominant arm). Participant will receive 2 doses 4 weeks apart (Day 1 and Day 29).
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Eligibility Criteria

Age Range18 Years to 49 Years
SexALL
Healthy VolunteersYes
Study Sites10

Inclusion Criteria: 1. 18 to 49 years of age 2. Informed consent form (ICF) signed and dated by the participant after reading the form and being advised of the risks and benefits of the trial in a language understood by the participant and before performance of any trial-specific procedures 3. Gene...

Countries:United States
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Frequently asked questions about Jynneos

What is Jynneos used for in Monkeypox (Mpox)?

Jynneos is a monoclonal antibody being developed for the prevention of Monkeypox (Mpox) infection. It is currently in Phase 2 clinical development as an investigational vaccine. The drug is being studied in healthy adult volunteers in the United States to assess its safety and immunogenicity.

What does Jynneos target?

Jynneos is a monoclonal antibody designed to target the vaccinia virus, which is closely related to the monkeypox virus. By targeting this virus, Jynneos aims to provide protection against Mpox infection. The specific molecular target has not been disclosed in available information.

Who makes Jynneos?

Jynneos is being developed by Icon Plc, a biopharmaceutical company listed on the NASDAQ under the ticker symbol ICLR. Icon Plc is conducting clinical trials to evaluate the safety and efficacy of Jynneos for the prevention of Monkeypox (Mpox).

What phase is Jynneos in?

Jynneos is currently in Phase 2 clinical development. It is an investigational drug and has not yet been approved by regulatory authorities. The ongoing Phase 2 trial is active but not recruiting participants, indicating that enrollment has been completed and the study is underway.

What clinical trials is Jynneos in?

Jynneos is being evaluated in a Phase 2 clinical trial with the identifier NCT07199569. This trial is titled "Comparability Trial of the MVA-BN Vaccine Manufactured in Different Production Cells" and is being conducted in the United States. The study enrolls 970 healthy adult volunteers aged 18 years and older, with a randomized, double-blind, active-controlled design.

Is Jynneos the same as MVA-BN?

Jynneos is being studied in a trial that compares the MVA-BN vaccine manufactured in different production cells. The trial title suggests that Jynneos may be related to or a version of the MVA-BN vaccine, but the available information does not explicitly state that Jynneos is the same as MVA-BN. The study aims to assess comparability between different manufacturing processes.