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Rickettsia typhi infection presenting as severe ARDS
Liem T Tran1, Jessica L Helms2, Miguel Sierra-Hoffman3
1Texas A&M Detar Family Residency Program, Victoria, TX, 77901, USA.
Abstract:
Murine typhus, also known as endemic typhus, is a disease resulting from an infection caused by the gram-negative bacillus Rickettsia typhi. Murine typhus is identified worldwide, predominantly in tropical and subtropical geographic locations. Transmission occurs through direct inoculation by an arthropod vector, most commonly the rat flea, Xenopsylla cheopis. rickettsial infections are notorious for disseminated infections throughout the endothelial cells. The increase in permeability is an immediate consequence and has the potential of leading to non-cardiogenic pulmonary edema, otherwise known as acute respiratory distress syndrome (ARDS). Clinical manifestations are non-specific and initially mimic typical viral etiologies, obscuring early diagnosis. As a result, clinicians often do not include rickettsial infections in their differential diagnoses. Definitive diagnosis is based on clinical recognition, epidemiologic awareness, and serological testing. Here we present a confirmed case of murine typhus in a young non-immunocompromised patient who developed ARDS one week from the initial onset of symptoms.
Insights
Murine typhus, caused by Rickettsia typhi, is a worldwide flea-borne disease. A case study highlights its potential to cause acute respiratory distress syndrome (ARDS) rapidly.
Area of Science:
- Infectious Diseases
- Microbiology
- Public Health
Background:
- Murine typhus is caused by Rickettsia typhi, a gram-negative bacillus found globally, particularly in tropical and subtropical regions.
- Transmission occurs via arthropod vectors, primarily the rat flea Xenopsylla cheopis.
- Rickettsial infections characteristically cause disseminated endothelial cell infections, leading to increased vascular permeability.
Observation:
- Clinical manifestations of murine typhus are often non-specific, mimicking viral illnesses, which can delay diagnosis.
- Rickettsial infections can lead to severe complications such as non-cardiogenic pulmonary edema, also known as acute respiratory distress syndrome (ARDS).
- Early diagnosis is challenging as rickettsial infections are frequently overlooked in differential diagnoses.
Findings:
- This report details a confirmed case of murine typhus in a young, non-immunocompromised patient.
- The patient developed acute respiratory distress syndrome (ARDS) within one week of symptom onset.
- Diagnosis relied on clinical recognition, epidemiological context, and serological confirmation.
Implications:
- This case underscores the potential for severe, rapid-onset complications like ARDS from murine typhus, even in healthy individuals.
- Highlights the importance of considering rickettsial infections in the differential diagnosis of febrile illnesses with respiratory symptoms.
- Emphasizes the need for heightened clinical awareness and prompt diagnostic evaluation for endemic typhus to prevent severe outcomes.
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