Observational Study Evaluating Clinical Benefit and Safety of AIGIV (ANTHRASIL®) in Patients With Systemic Anthrax

Inclusion Criteria: * Confirmed or suspected systemic anthrax patients in the USA or other jurisdictions (if feasible) treated with AIGIV provided by the Centers for Disease Control and Prevention (CDC). * Systemic anthrax defined as a clinically compatible case of gastrointestinal, injectional, or inhalational anthrax; anthrax meningitis or bacteremia; or cutaneous anthrax with systemic effects (i.e. tachycardia, tachypnea, hypotension, hyperthermia, hypothermia, leukocytosis) or with lesions that involve the head, neck or upper torso, or are large, bullous, multiple, or surrounded by significant edema PLUS confirmation by one of the following: Epidemiologically linked to a documented anthrax environmental exposure. Laboratory confirmation by isolation of B. anthracis from an affected tissue or site. Demonstration of B. anthracis antigens in tissues by immunohistochemical staining using both B. anthracis cell wall and capsule monoclonal antibodies. Evidence of B. anthracis DNA; for example, by polymerase chain reaction (PCR) in specimens collected from a normally sterile site (such as blood or cerebrospinal fluid (CSF)) or lesion of other affected tissue(s) (skin, pulmonary, reticuloendothelial, or gastrointestinal). QuickELISA™ Anthrax-PA kit manufactured by Immunetics, Inc. for detection of anti-PA antibodies in serum, plasma, and pleural/ascitic fluid. RedLine Alert™ test manufactured by Tetracore, Inc., for identification of B. anthracis colonies. * Informed consent/assent (as applicable). Exclusion Criteria: * There are no exclusion criteria for subjects enrolling in this study.