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Jynneos

Phase 2

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

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindACTIVE_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment970
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07199569Comparability Trial of the MVA-BN Vaccine Manufactured in Different Production CellsPHASE2 ACTIVE NOT_RECRUITING 970Oct 27, 2025Nov 30, 2026Apr 8, 202610 United States
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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 — 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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Recent Changes (Last 90 Days)
MEDIUMMay 26, 2026NCT07199569Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWMay 24, 2026NCT07199569studyFirstPostDate: changed