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Introduction. The study aimed to compare the etiologic spectrum of diseases causing fever of unknown origin (FUO) and methods for definitive diagnosis in a tertiary care hospital in the Republic of North Macedonia during two different time periods. Patients and methods. There were analysed retrospectively the causes for FUO and final diagnostic approaches in 185 patients with classic FUO that were treated at the University Hospital for Infectious Diseases in Skopje during two time periods. Seventy nine patients were treated during 1991 to 1995 and 106 patients during 2011 to 2015. Results. When comparing these two periods, infections were present in 46.8% and 29.2% (p = 0.014), non-infective inflammatory disorders in 22.8% and 25.5% (p = 0.674), neoplasms in 10.1% and 13.2% (p = 0.522), miscellaneous in 8.9% and 12.3% (p = 0.461) and undiagnosed cases in 11.4% and 19.8% (p = 0.124), respectively. The most common causes for FUO during the first period were abscesses (8.9%), tuberculosis and systemic lupus erythematosus (7.6% each), whereas in the second period the commonest causes were adult onset Still disease and solid organ neoplasm (7.6% each), polymyalgia rheumatica, abscesses and visceral leishmaniasis (5.7% each). The newer imaging techniques and clinical course evaluation had superior diagnostic significance during the second period. Conclusion. A changing pattern of diseases causing FUO during the examined periods was evident. Infections continue to be the most common cause but with decreasing incidence when compared to 20 years ago. Even nowadays clinical evaluation and follow-up still remain the vital diagnostic tools in determining the etiology of FUO.

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Brucella thyroiditis represents an extremely rare focal form of brucellosis. In this case report we describe a 55 years old male, diagnosed with brucellosis and peripheral arthritis with subsequent development of acute thyroiditis. The symptoms duration consistent with brucellosis started two weeks before establishing the diagnosis. Only a day after diagnosis and initiation of antibrucellar treatment, acute non-suppurative thyroiditis suddenly manifested. Thyroiditis was diagnosed with clinical inspection and confirmed by ultrasound investigation. With the appropriate antibrucellar treatment, complete cure of thyroid affection was reached in ten days and the patient remained well during the follow-up period of two and a half years. In conclusion, in brucellosis endemic regions brucellosis should be included in the diagnostic consideration in patients with acute non-suppurative thyroiditis. Early recognition and adequate treatment of brucella thyroiditis results in favorable outcome.

Objectives. The aim is to describe the phenotypic, biological and clinical characteristics of hospitalized patients with COVID-19 and diabetes, and the association with the clinical outcome of the patients. Material and methods. This single-center, retrospective study was conducted on 200 patients. The primary endpoint was death observed within day 7, 14 and beyond day 14 of hospitalization, and secondary objective was to compare the survival group with non-survival group. The variables that demonstrated significant association with primary endpoint were subject to multivariate binary logistic regression analysis. Outcomes. The estimated prevalence was 17.87% of the total COVID-19 hospitalizations during this period (n=1119). The majority of the patients were with diabetes mellitus type 2 with a median age of 67 years and BMI of 27.8 kg/m2. On admission, 156 patients (78%) presented with severe/critical illness. A total of 93 patients (46.5%) met the primary endpoint, with most deaths occurring within day 7 of hospital stay. Non-survival group showed significantly higher levels of leucocytes count, more pronounced lymphopenia, higher CRP, LDH and D-dimer levels. Multivariate analysis identified four independent risk factors associated with death: age OR 1.05 (CI 95% 1.01-1.09), severity of disease at admission OR 0.22 (CI 95, 0.07-0.65), COVID-19 vaccination status OR 3.07 (CI 95%, 1.36-6.91) and LDH levels OR 1.00 (CI 95%,1.002-1.008). Conclusions. Diabetic patients admitted to hospital for COVID-19 infection tend to have high mortality rate. Severity of disease at admission, advanced age, not completed vaccination and increased LDH levels are independent risk factors for lethal outcome, irrespective of diabetes status.