Fulminant Neisseria septicemia with secondary hemophagocytic lymphohistiocytosis

A 26-year-old male soldier stationed in hilly terrain presented with a febrile illness followed by migratory inflammatory arthritis and non-blanchable petechial lesions over the lower limbs. On admission to a tertiary center, he exhibited respiratory distress, a pansystolic murmur, and elevated acute-phase reactants. Initial investigations suggested sepsis with suspicion of infective endocarditis, but transthoracic echocardiography was unremarkable. Bone marrow examination revealed hemophagocytic lymphohistiocytosis (HLH), and bone marrow cultures identified Neisseria meningitidis , confirming fulminant meningococcal septicemia as the underlying cause. The patient was treated with intravenous immunoglobulin and broad-spectrum antibiotics, resulting in significant clinical improvement. This case highlights the rare presentation of N. meningitidis septicemia complicated by secondary HLH and the importance of early diagnosis and multidisciplinary management.