Abstract
Acinetobacter baumannii is a Gram-negative bacterium that opportunistically infects critically ill hospitalized patients with breaches in skin integrity and airway protection, leading to significant morbidity and mortality. Considering the paucity of well-established animal models of immunosuppression to study A. baumannii pathogenesis, we set out to characterize a murine model of immunosuppression using the alkylating agent cyclophosphamide (CYP). We hypothesized that CYP-induced immunosuppression would increase the susceptibility of C57BL/6 mice to developing A. baumannii-mediated pneumonia followed by systemic disease. We demonstrated that CYP intensified A. baumannii-mediated pulmonary disease, abrogated normal immune cell function and led to altered pro-inflammatory cytokine release. The development of an animal model that mimics A. baumannii infection onset in immunosuppressed individuals is crucial for generating novel approaches to patient care and improving public health strategies to decrease exposure to infection for individuals at risk.
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