A Phase 4 interventional study of Sample Collection in Infections, Bacterial, sponsored by Emergent BioSolutions. Not yet recruiting. Per ClinicalTrials.gov, last updated 2026-02-06.
Sponsored by Emergent BioSolutions · Phase 4, Interventional, and Treatment
This field study is designed such that it may be implemented for any individual with symptomatic inhalational anthrax who has been administered raxibacumab for treatment of anthrax following a mass exposure scenario. This study is designed to describe the clinical effectiveness (including course of illness and survival) and safety profile from patients who are treated with raxibacumab as part of their clinical care following exposure to B. anthracis. Study data and other investigational research will be collected prospectively to the extent possible at pre-specified time points. However, because of the logistical complexities that would likely accompany a mass anthrax event, most data in this study is anticipated to be collected retrospectively. During such a mass anthrax event, scavenged blood samples will be utilized where possible to maximize sample analyses and other investigational parameters. Therefore, both retrospective and prospective data collection are allowed in this protocol in order to maximize the amount of information obtained in subjects who have been administered raxibacumab. This field study will be the first opportunity to collect data on B. anthracis-exposed patients treated with raxibacumab, to better understand the clinical benefit and safety of the drug and to further inform patient care and treatment choices for management of anthrax.
The protocol is a post-marketing requirement from the FDA to evaluate the clinical benefit and safety of raxibacumab administered to patients with symptomatic inhalational anthrax as part of their medical care following a mass exposure scenario to Bacillus anthracis.
75 studies on the registry are indexed under Anthrax; 12 are open to participants now.
This study's planned enrollment of 100 is close to the median of 100 across 57 interventional studies indexed under Anthrax.
Browse Anthrax studies →Emergent BioSolutions is the lead sponsor of 47 studies on the registry; 7 are open to participants now.
Of its 11 completed or terminated interventional studies of FDA-regulated products, 7 (64%) have results posted.
Compared within Anthrax, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Bacterial Infections. The counts are of registry records indexed under each term, refreshed daily. How we classify →
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
This is an open-label, single arm study. The study will be implemented for subjects with symptomatic inhalational anthrax who receive FDA-approved raxibacumab as part of medical treatment of anthrax following a mass exposure scenario. Intervention: Sampling of subjects or use of subjects salvaged standard of care samples may be considered for the following assessments (if available/applicable): analysis of antibodies to PA (anti-PA), protective antigen (PA), and lethal factor (LF).
Biological: Sample Collection
Whenever possible serum samples will be collected from all subjects to determine serum raxibacumab concentrations pre-infusion, and at specific timepoints post-infusion. In the event cerebrospinal fluid (CSF), pleural, ascites, or bronchoalveolar lavage (BAL) fluid are collected for ad hoc clinical laboratory testing, any remaining excess sample will be provided to Sponsor for determination of raxibacumab concentrations. Any available serum remaining from ad hoc clinical laboratory specimen collections prior to raxibacumab administration will be provided to Sponsor for measurement of serum PA concentrations. In addition, remaining post raxibacumab dose serum specimens may also be analyzed for lethal factor (LF) levels.
Evaluate Clinical Benefit of Raxibacumab for Patients with Symptomatic Inhalational Anthrax
Evaluate the clinical benefit of raxibacumab for the treatment of inhalational anthrax disease in a mass exposure scenario such as intentional B. anthracis release during a bioterrorist attack.
Time frame: Up to Day 29
Evaluate Safety of Raxibacumab for Patients with Symptomatic Inhalational Anthrax
Evaluate the safety of raxibacumab for the treatment of inhalational anthrax disease in a mass exposure scenario such as intentional B. anthracis release during a bioterrorist attack.
Time frame: Up to Day 29
Evaluate the Clinical Course of Disease
To evaluate the clinical course of the disease in patients with inhalational anthrax disease.
Time frame: Up to Day 29
No study locations are listed for this record.
Plan to share: No
No publications or documents are linked to this record.
This study is not yet recruiting, as verified in Feb 2026. You cannot join it, but the record below documents what was studied.
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