“…Several literature data, especially from developed countries, note the decreasing trend of infections and the rising frequency of NIID as causative factors for FUO during the last decades [4,24]. Despite the decline of infections in the recent times, they still remain a leading category for FUO, especially in community hospitals in developed and in tertiary health care institutions in developing countries [13,18,19,21], as was the case in our study, too. During the last decades, a decreasing trend was noted in malignancies group due to improved diagnostics [7,11,29,30], which was not the case in our material where diagnostic procedures were almost the same as in the previous period.…”