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 Ancylostoma, Strongyloides, Filaria, Echinococcus, Trichinella, Toxocara, Fasciola,
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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