There is a high probability that the patient was infected with Brucella bacteria. Diagnostic challenges and the rarity of the disease, considered non-existent in Poland, hinder prompt confirmation or exclusion of infection. The authors aimed to highlight the possibility of a higher frequency of brucellosis in Poland. They suggest that Brucella bacteria may still be present, causing chronic, unrecognized, recurrent fevers. Based on the case analysis, the authors indicate that the frequent occurrence of this disease in Poland might be higher than reported by statistics.
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