Rickettsia conorii infection with fatal complication

Area of Science:

• Infectious Diseases
• Pathology
• Molecular Diagnostics

Background:

• Rickettsial diseases (RD) are endotheliotropic infections caused by *Rickettsia* species.
• Misdiagnosis of RD is common due to non-specific symptoms and limited diagnostic tools.
• Clinical presentations range from mild febrile illness to life-threatening complications.

Observation:

• A young male presented with acute febrile illness, shock, and respiratory failure, leading to death.
• Post-mortem examination revealed histological signs of endotheliotropic infection and vasculitis in multiple organs.
• Histological findings included interstitial edema, perivascular edema, and noncardiogenic pulmonary edema.

Findings:

• Molecular studies confirmed spotted fever group rickettsial disease caused by *Rickettsia conorii*.
• The autopsy findings were consistent with a severe, disseminated rickettsial infection.
• Evidence of increased vascular permeability and vasculitis was noted in the lung, liver, and intestines.

Implications:

• This case underscores the potential severity and diagnostic challenges of rickettsial diseases.
• Accurate and timely diagnosis is crucial for effective management and preventing fatal outcomes.
• Highlights the utility of post-mortem molecular diagnostics in confirming rickettsial infections.