A Phase 2 Safety and Immunogenicity Study for an Anthrax Vaccine Using 3 Schedules and Two Dose Levels

A Phase 2, Randomized, Parallel-Group, Active-Controlled, Double-Blind Study to Evaluate the Safety and Immunogenicity of AV7909 for Post-Exposure Prophylaxis of Anthrax Using Three Immunization Schedules and Two Dose Levels in Healthy Adult Volunteers

The purpose of this study is to assess the safety and immunogenicity of an anthrax vaccine. The vaccine schedule and dose will also be assessed.

Study Overview

• Status: Completed
• Conditions: Anthrax
• Intervention / Treatment: Biological: AV7909; Biological: BioThrax

Detailed Description

The safety and immunogenicity of AV7909 for post-exposure prophylaxis of anthrax will be evaluated using a randomized, parallel-group, active-controlled, double-blind design with three immunization schedules and two dose levels in healthy adult volunteers. Safety will be assessed by clinical laboratory tests (hematology, serum chemistry, and urinalysis), monitoring of adverse events, vital signs, and physical examinations. Reactogenicity (systemic and injection site reactions) will be assessed by the subjects using subject e-diaries for 7 days after each immunization and by the investigator at in-clinic visits 7 and 14 days after each immunization, and at other visits, if applicable. Immunogenicity will be measured as toxin neutralizing antibody (TNA) response and seroconversion rates.

• Study Type: Interventional
• Enrollment (Actual): 168
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • Florida
    • Miami, Florida, United States, 33143
      • Miami Research Associates
  • South Carolina
    • Mount Pleasant, South Carolina, United States, 29464
      • Costal Carolina Research
  • Texas
    • New Braunfels, Texas, United States, 78130
      • Central Texas Allergy and Asthma
  • Utah
    • Salt Lake City, Utah, United States, 84124
      • Jean Brown Research

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 50 years (Adult)
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Be 18-50 years old
• Be in good health
• Have access to a computer and the internet so you can complete a diary
• Agree to abstain from sex the first 84 days of the study or practice birth control if you are a woman who is able to get pregnant
• Have not donated blood for the previous 8 weeks

Exclusion Criteria:

• A known anaphylactic response, severe systemic response, or serious hypersensitivity reaction to a prior immunization.
• A history of latex allergy.
• Have received a shot (vaccine), including flu shots, in the past 6 weeks or plan to get a shot for 4 weeks after the last study shot is given.
• Have previously served in the military any time after 1990 or plan to enlist in the military from Screening through Day 84.
• Prior immunization with anthrax vaccine, recombinant protective antigen (rPA) vaccine, or known exposure to anthrax organisms.
• Have participated in anthrax therapeutic or vaccine studies (monoclonal anti-PA or anthrax immune globulins or anthrax vaccines).
• Participation in any investigational study involving use of a pharmacological intervention within 30 days before the Screening visit or planning to participate in a study requiring dosing through the 12-month safety follow-up telephone call.
• Have a known diagnosis of any immunodeficiency disease including but not limited to: acquired immune deficiency syndrome (AIDS), common variable immunodeficiency disease, immunoglobulin A (IgA) deficiency, or hypogammaglobulinemia.
• Past history of significant autoimmune disease such as rheumatoid arthritis, lupus erythematous, psoriasis in the area of vaccinations, or requires immunotherapy, glomerulonephritis, or autoimmune thyroiditis.
• Have received immunosuppressive therapy with cytotoxic drugs or Rituximab within the past 2 years.
• A history of cytotoxic chemotherapy or radiation therapy.
• Chronic (>10 days) daily oral or parenteral corticosteroid therapy in the past 12 months.
• Any lung disease, including reactive airway disease, which requires the daily use of medications.
• A female currently breastfeeding or with a positive pregnancy test.
• A history of drug or alcohol abuse within 12 months prior to Screening, or a positive result on a urine drug screen for cocaine, marijuana, opiates, methamphetamines, benzodiazepines, or oxycodone.
• Any tattoo or other skin condition in the deltoid region on either arm that may obscure the assessment of the injection sites.
• A medical condition that, in the opinion of the PI or designee, could adversely impact the subject's participation or safety or the conduct of the study.
• Any planned elective in-patient surgery during the study period.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

5

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: AV7909 (Day 0 and 14); Route of administration: Intramuscular Dose: 0.5 mL Schedule: Day 0 and Day 14	Biological: AV7909; Anthrax Vaccine Adsorbed plus CPG 7909 Adjuvant; Other Names: NuThrax; AV7909 Anthrax Vaccine
Experimental: AV7909 (Day 0 and 28); Route of administration: Intramuscular Dose: 0.5 mL Schedule: Day 0 and Day 28	Biological: AV7909; Anthrax Vaccine Adsorbed plus CPG 7909 Adjuvant; Other Names: NuThrax; AV7909 Anthrax Vaccine
Experimental: AV7909 (Day 0, 14, and 28); Route of administration: Intramuscular Dose: 0.5 mL Schedule: Day 0, Day 14,and Day 28	Biological: AV7909; Anthrax Vaccine Adsorbed plus CPG 7909 Adjuvant; Other Names: NuThrax; AV7909 Anthrax Vaccine
Experimental: AV7909 Reduced Dose; Route of administration: Intramuscular Dose: 0.25 mL Schedule: Day 0, Day 14,and Day 28	Biological: AV7909; Anthrax Vaccine Adsorbed plus CPG 7909 Adjuvant; Other Names: NuThrax; AV7909 Anthrax Vaccine
Active Comparator: BioThrax; Route of administration: Intramuscular Dose: 0.5 mL Schedule: Day 0, Day 14,and Day 28	Biological: BioThrax; Other Names: Anthrax Vaccine Adsorbed (AVA)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Toxin Neutralizing Antibody (TNA) Level at Day 63	Immunogenicity measured by the lower bound (LB) of the 95% confidence intervals (CIs) for the proportion of subjects in each study arm with Day 63 TNA 50% neutralization factor (NF50) values greater than or equal to threshold	Day 63
Incidence of Adverse Events	Incidence of adverse events (including assessment of symptoms, physical exam findings, clinical laboratory tests, and vital signs) from the time of the first immunization on Day 0 through Day 84	From the time of the first immunization on Day 0 through Day 84
Incidence of Serious Adverse Events	Incidence of serious adverse events, from the time of the first immunization on Day 0 through the 12-month safety follow-up telephone call following the last scheduled vaccination	From the time of the first immunization on Day 0 through the 12-month safety follow-up telephone call following the last scheduled vaccination
Incidence of Reactogenicity By Severity	Incidence of solicited systemic reactions and solicited injection site reactions each day for 7 days following each vaccination using subject e-diaries by severity. Reactions were graded using the following scale (note, for redness and swelling, the diameter [greater of two perpendicular measurements] was assessed by the subject using an injection site measurement tool): Grade 0 (Absent): Symptom not present; Grade 1 (Mild): Symptom present but does not interfere with activities of daily living, or affected area (redness, swelling) measures <3 cm; Grade 2 (Moderate): Symptom causes some interference with activities of daily living, or affected area (redness, swelling) measures 3 - 10 cm; Grade 3 (Severe): Symptom prevents activities of daily living or requires treatment, or affected area (redness, swelling) measures > 10 cm. For each reaction, subjects are counted once across all vaccinations at the highest reported level of severity.	For 7 days following each vaccination on Days 0, 14, 28
Incidence of Clinical Laborabory Abnormalities	Incidence of clinical laboratory abnormalities throughout the study (up to Day 84). Clinical laboratory abnormalities are presented as the total of Grade 1 (mild), Grade 2 (moderate), Grade 3 (severe), and Grade 4 (potentially life-threatening) abnormalities according to criteria adapted from the U.S. Department of Health and Human Services, Food and Drug Administration, Center for Biologics Evaluation and Research: Guidance for Industry. Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials (September 2007). Within each laboratory parameter, subjects are counted once for their most severe occurrence of clinical laboratory abnormality.	From the time of first immunization on Day 0 to Day 84
Incidence of Immunologically Significant Adverse Events of Special Interest	Incidence of immunologically significant adverse events of special interest as defined by the Center for Biologics Evaluation and Research from the time of the first immunization on Day 0 through the 12-month safety follow-up telephone call following the last scheduled vaccination	From the time of the first immunization on Day 0 through the 12-month safety follow-up telephone call following the last scheduled vaccination

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
TNA Level at Day 42	Immunogenicity measured by the percentage of subjects in each study arm with Day 42 TNA NF50 values greater than or equal to threshold	Day 42
TNA Level at Day 28	Immunogenicity measured by the percentage of subjects with Day 28 TNA NF50 values greater than or equal to threshold	Day 28
TNA Seroconversion Rate	Immunogenicity measured by the percentage of subjects who have seroconverted (defined as a 4-fold increase over Day 0 in TNA NF50 value) at Days 21, 28, 35, 42, 49, 63, and 84	Up to Day 84

Collaborators and Investigators

• Sponsor: Emergent BioSolutions
• Collaborators: National Institute of Allergy and Infectious Diseases (NIAID)
• Investigators: Principal Investigator: Gurdyal Kalsi, MD, MTOPRA, Emergent BioSolutions

Study record dates

Study Major Dates

• Study Start: January 1, 2013
• Primary Completion (Actual): February 1, 2014
• Study Completion (Actual): December 1, 2014

Study Registration Dates

• First Submitted: January 16, 2013
• First Submitted That Met QC Criteria: January 16, 2013
• First Posted (Estimated): January 18, 2013

Study Record Updates

• Last Update Posted (Actual): March 18, 2024
• Last Update Submitted That Met QC Criteria: March 14, 2024
• Last Verified: March 1, 2024

More Information

Terms related to this study

• Keywords: post-exposure prophylaxis; toxin neutralization assay
• Additional Relevant MeSH Terms: Infections; Bacterial Infections; Bacterial Infections and Mycoses; Gram-Positive Bacterial Infections; Bacillaceae Infections; Anthrax; Physiological Effects of Drugs; Immunologic Factors; Vaccines
• Other Study ID Numbers: EBS.AVA.208 / DMID 11-0055; HHSN272201000035C (Other Grant/Funding Number: National Institute of Allergy and Infectious Diseases)