Microflora of nasopharynx in 117 patients with urticaria was studied. 589 cultures of gram-negative and Gram-positive bacteria were isolated. Gram-positive bacteria represented the overwhelming majority of isolates from which streptococci dominated with high level of constancy (C=91.4%) and prevalence on mucosa. Several patients had signs of chronic streptococcal infection that support the possible role of streptococci in development of urticaria.
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