Trial Parameters
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Brief Summary
This protocol describes a clinical trial to develop and validate a Controlled Human Infection Model (CHIM) for influenza A/Arkansas/08/2020 (pH1N1). The study is designed to determine the optimal infectious dose of the pH1N1 challenge strain for use in future clinical trials evaluating influenza countermeasures. The study will enroll and challenge adult volunteers with the pH1N1 influenza virus challenge or sham inoculations. Given the adaptive design of this trial, the potential number of participants can vary. Depending on the pathway recommended by the PSRT and followed in the Trial Schema, the study population can range from around 30 to 120. However, it is anticipated that the final sample size will be around 60 participants receiving pH1N1 challenge product plus approximately 4 persons receiving a sham inoculation. Participants will be pre-screened for health and for serological HAI antibody titers of \</1:40 against the challenge strain. Eligible participants will be enrolled sequentially into challenge cohorts and will be randomly assigned to receive a single dose of either sham inoculation or the interventional study product at a dose between 10\^6 to 10\^7 TCID50 (or 10\^5 TCID50 if needed). Dose titration will be conducted under an adaptive escalation schedule whereby dosing will start at 10\^6 TCID50 and escalate to the next dose if a pre-determined symptomatic influenza attack rate and clinical symptom score thresholds are not met and if the dose is determined to be safe with no pre-defined halting criteria being met. The primary objectives of this study are to determine the optimal infectious dose of a pH1N1 viral challenge to cause laboratory-confirmed clinical influenza and to assess the safety profile of pH1N1 viral challenge.
Eligibility Criteria
Inclusion Criteria: 1. Provides signed and dated informed consent form prior to the initiation of any trial procedures. 2. Able to understand and agrees to comply with all planned trial procedures and to be available for all study visits. 3. Age \>/= 18 and \</= 55 years at time of enrollment. 4. Must agree to collection of venous blood and nasal absorption specimens per protocol and enrollment in DMID 19-0025 biorepository protocol for use of residual/repository research blood specimens. 5. In good general health.\* \*Good health, as determined by medical history, medication use and physical examination to evaluate ongoing chronic medical or psychiatric diagnoses or conditions, defined as those that have been present for at least 90 days, which would not affect the assessment of the safety of participants or the immunogenicity of challenge. These medical diagnoses or conditions should be stable for the last 90 days -- no hospitalizations, emergency room or urgent care for condition (e