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Erythema Nodosum Leprosum: Inflammatory Fever Mimicking Infection

Mudita Khattri*, Ritu Sangwan

Department of Medicine (ID Division), All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India.

Case Vignette

A 43-year-old male, farmer with no known comorbidities, presented with history of recurrent fever for one year and painful nodular skin lesions over bilateral upper limb and trunk for 2.5 years, progressively increasing in number. Examination revealed tender erythematous nodules and thickened peripheral nerves, including bilateral ulnar and greater auricular nerves. Laboratory evaluation showed markedly elevated ESR, while blood culture and other microbiological work-up returned negative. Slit-skin smear demonstrated acid-fast bacilli (5+), and skin biopsy done was consistent with erythema nodosum leprosum (ENL). Empirical antibiotics which were started were stopped. Diagnosis of lepromatous leprosy with type 2 lepra reaction was considered, and the patient improved with systemic corticosteroids and multidrug therapy (MDT)

 


Figure 1: Thickening of Greater Auricular Nerve            

Ques. In this patient of leprosy presenting with recurrent fever and tender erythematous nodules, which of the following best explains the mechanism responsible for his fever?

  1. Delayed hypersensitivity reaction due to enhanced cell mediated immunity

  2. Immune complex mediated inflammatory response related to high bacillary load

  3. Secondary bacterial infection due to impaired skin barrier

  4. Cytokine release following rapid bacillary killing after multidrug therapy

ANSWER: The answer will be released in the upcoming September 2026 issue.

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 Copyright © Author(s) 2026. JASPI- Journal of Antimicrobial Stewardship Practices and Infectious Diseases.

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