Monday 28 January 2019

P URTICARIA X PICORNAVIRUS

What infections are associated with acute urticaria?

  • Picornavirus (most common), coronavirus, respiratory syncytial virus, and several others including the hepatitis viruses and HIV.
  • Infection with various picornaviruses may manifest as a common cold, a febrile rash illness (hand-foot-and-mouth disease), conjunctivitis, herpangina, aseptic meningitis, encephalitis, myositis, myocarditis, and hepatitis.
  • Interestingly, acute urticaria, refractory to antihistamines but responsive to azithromycin has been associated with Mycoplasma pneumoniaei nfection in children.
  • Parasites such as AncylostomaStrongyloidesFilariaEchinococcusTrichinellaToxocaraFasciola,
Schistosoma mansoni, and Blastocystis hominis have all been associated with urticaria. It is only necessary to undertake stool microscopy and investigation in patients with eosinophilia and a significant travel history.

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