. 2016 Sep 26;128(21):796–801. doi: 10.1007/s00508-016-1083-9

Table 1.

Causes of classic fever of unknown origin

¹NIID, Non-infectious inflammatory disease

Author (pub. year)	Infection (%)	Neoplasm (%)	NIID¹ (%)	Misc. (%)	Undiagnosed (%)
Petersdorf (1961) [1]	36	19	19	19	7
Larson (1982) [7]	30	31	16	11	12
Knockaert (1992) [6]	22.5	7	23	21.5	26
De Kleijn (1997) [9]	26	12	25	8	30
Bleeker-Rovers (2007) [10]	16	7	22	4	51