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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
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Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
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Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
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A life threatening rash, an unexpected cause.

Dhiraj Jain1, Stalin Viswanathan1, Chandramohan Ramasamy2

  • 1Department of General Medicine, Indira Gandhi Medical College & RI, Pondicherry 605009, India.

Case Reports in Dermatological Medicine
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Scrub typhus can cause purpura fulminans, a severe condition. Early doxycycline treatment is crucial for patients with this illness in endemic regions.

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Area of Science:

  • Infectious Diseases
  • Dermatology
  • Critical Care Medicine

Background:

  • Purpura fulminans is a rare, life-threatening condition characterized by disseminated intravascular coagulation and skin necrosis.
  • Acute febrile illnesses can present with diverse and severe dermatological manifestations.

Purpose of the Study:

  • To report a case of purpura fulminans secondary to scrub typhus.
  • To highlight the importance of considering scrub typhus in the differential diagnosis of purpura fulminans, especially in endemic areas.

Main Methods:

  • Case report of a 74-year-old male patient.
  • Clinical presentation, diagnostic workup, and treatment course are described.
  • Response to doxycycline therapy after failure of standard sepsis management.

Main Results:

  • The patient presented with purpura fulminans and altered sensorium after an acute febrile illness.
  • Initial intensive sepsis management was ineffective.
  • Doxycycline therapy led to clinical improvement after confirmation of scrub typhus.

Conclusions:

  • Scrub typhus should be considered in patients presenting with purpura fulminans in endemic areas.
  • Empirical doxycycline therapy may be life-saving in suspected cases.
  • Early diagnosis and treatment of scrub typhus are critical to prevent severe complications like purpura fulminans.