Table 2. Final diagnosis of febrile travelers returning from tropical countries, Sweden, March 2005–March 2008*.

Final diagnosis	Additional serologic analysis, n = 383, no. (%) patients	Routine investigations only, n = 1,049, no. (%) patients	p value
Fever of unknown etiology	91 (24)	372 (35)	<0.0001
Influenza	34 (9)	38 (4)	<0.001
Dengue fever	17 (4)	27 (3)	NS
Rickettsial infection	17 (4)	15 (1)	<0.001
Leptospirosis	4 (1)	3 (0.2)	NS
Q fever	3 (0.7)	0	0.004
Chikungunya fever	1	0	NS

*NS, not significant.