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CDI-988

Phase 1/2

Norovirus | Small Molecules | Infectious Disease |Cocrystal Pharma, Inc.|Trials Updated: Oct 22, 2026

CDI-988 development status

Highest phase Phase 1/2 (NCT07198139)
Phase scored for COCPPhase 1
Registered trials 2 across 1 sponsor since Aug 2023

CDI-988 target and mechanism

Molecular targetprotease
Target classEnzyme
ModalitySmall Molecules

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment32

FDA Designations

FAST_TRACK

CDI-988 clinical trials

CDI-988 · 1 trial · 1 indication

Phase 1/2 1
NCT07198139A Study to Evaluate the Efficacy, Safety and Pharmacokinetics of CDI-988 in Healthy Adults After Challenge With Snow Mountain VirusNorovirus
COMPLETED32 Analytics
PHASE1/PHASE2COMPLETED
A Study to Evaluate the Efficacy, Safety and Pharmacokinetics of CDI-988 in Healthy Adults After Challenge With Snow Mountain Virus
NorovirusUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of norovirus-confirmed disease
Day 0 to Day 21

Disease is defined as diarrhea and/or vomiting (during the inpatient period), with laboratory-confirmed infection (with SMV specific primers on stool/emesis) or seroconversion

Secondary Endpoints

Modified Vesikari Score (MVS) symptom scores during the inpatient period in infected patients
Day 1 to Day 6
Time to symptom improvement
Day 1 to Day 6
Time to first SMV-negative stool
Day 1 to Day 6
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Snow Mountain VirusOTHERChallenge with Snow Mountain Virus
Stage 2: Drug CDI-988EXPERIMENTAL -
Stage 2: PlaceboPLACEBO_COMPARATOR -

Interventions

NameTypeDescription
CDI-988DRUGAntiviral to treat norovirus
PlaceboDRUGMatching placebo
Snow Mountain VirusOTHERChallenge with Snow Mountain Virus
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Eligibility Criteria

Age Range18 Years to 49 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Healthy male or non-pregnant female * Aged 18 to 49 years * Good state of health * Known fucosyl transferase 2 (FUT2) secretor status Exclusion Criteria: * History of participation in any norovirus challenge or vaccine clinical trial * Receipt or planned receipt of any non-l...

Countries:United States
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Recent Changes (Last 90 Days)

HIGHOct 22, 2026NCT07198139Status: RECRUITING → COMPLETED
HIGHOct 22, 2026NCT07198139Status: RECRUITING → COMPLETED

Frequently asked questions about CDI-988

What is CDI-988?

CDI-988 is an investigational small molecule antiviral being developed by Cocrystal Pharma, Inc. for norovirus. It is an oral protease inhibitor that has completed a Phase 1 human challenge study in healthy adult volunteers in the United States. It has received Fast Track designation from the FDA.

What is CDI-988 used for in norovirus?

CDI-988 is being developed to treat norovirus infection. Its clinical program has studied the drug in healthy adults challenged with Snow Mountain Virus, a norovirus strain, to evaluate efficacy, safety, and pharmacokinetics. CDI-988 remains investigational and is not approved for any use.

What does CDI-988 target?

CDI-988 targets a viral protease, an enzyme essential to norovirus replication. By inhibiting this protease, the small molecule is designed to interfere with the virus's ability to copy itself. The protease mechanism is the basis for its development as an oral antiviral against norovirus.

Who is developing CDI-988?

CDI-988 is being developed by Cocrystal Pharma, Inc., a biopharmaceutical company whose common stock trades under the ticker COCP. Cocrystal is advancing CDI-988 as an oral small molecule antiviral candidate for norovirus in its infectious disease pipeline.

What phase is CDI-988 in?

CDI-988 is in Phase 1 development. Its single listed clinical trial, a Phase 1 human challenge study in healthy adults, has been completed. CDI-988 is investigational and has not been approved by the FDA for norovirus or any other indication.

What clinical trials is CDI-988 in?

CDI-988 has been studied in one clinical trial, NCT07198139, titled a study to evaluate the efficacy, safety and pharmacokinetics of CDI-988 in healthy adults after challenge with Snow Mountain Virus. The Phase 1 trial was randomized, double-blind, placebo-controlled, enrolled 32 participants in the United States, and is completed.