Table 1. Characteristics of 1,432 febrile travelers returning from tropical countries, Sweden, March 2005–March 2008*.
| Characteristics | Patients with routine investigations |
Prospectively identified patients with routine investigation + additional serologic analysis, n = 383 | |
|---|---|---|---|
| Prospectively identified, n = 131 | Retrospectively identified, n = 918 | ||
| Median age, y (range) | 32 (18–65) | 36 (18–84) | 37 (18–76) |
| Median duration of stay, d | 20 | 21† | 20 |
| Female gender | 56 (43) | 420 (46) | 162 (42) |
| Travel to Africa | 69 (53) | 430 (47) | 199 (52) |
| Travel to Asia | 53 (40) | 427 (46) | 169 (44) |
| Travel to America | 10 (8) | 63 (7) | 20 (5) |
| Tourists | 76 (58) | 581(63)‡ | 247 (64) |
| VFR | 10 (8), p = 0.05§ | 126 (14)‡ | 20 (5), p<0.0001§ |
| Pretravel influenza immunization | 8 (6) | NA | 53 (14) |
| Hospitalized after return to Sweden | 37 (28) | 258 (28) | 123 (32) |
*Values are no. (%) patients except as indicated. Some travelers visited >1 region, making the percent sum >100%. VFR, visiting friends and relatives (Swedish residents who were born in a malaria-endemic country and who had visited friends and relatives in their country of origin); NA, not applicable. †In 115 patient files, this information was missing. ‡In 39 patient files, information on type of travel was missing. §Compared with retrospectively identified patients.