Table 1.
Study population
| Population without paired serum samples (%) | Population with paired serum samples (%) | P-value | |
| Total number | 1399 | 697 | |
| Females/males (ratio) | 611/788 (0.78) | 256/441 (0.58) | 0.002 |
| Age*(years, median, range) | 15 (1–82) | 24 (4 – 82) | <0.001 |
| ≤ 15 year | 715 (51) | 181 (26) | |
| > 15 years | 682(49) | 516 (74) | |
| Occupation | <0.001 | ||
| Farmer | 473 (33.8) | 347 (49.8) | |
| Pupil | 568 (40.6) | 200 (28.7) | |
| Child at preschool age | 159 (11.4) | 4 (0.6) | |
| Worker or fisherman | 109 (7.8) | 67 (9.6) | |
| Retired age | 30 (2.1) | 11 (1.6) | |
| Government employee | 21 (1.5) | 17 (2.4) | |
| Other | 39 (2.8) | 51 (7.3) | |
| Presumptive diagnosis | <0.001 | ||
| Undifferentiated fever | 689 (49.2) | 387 (55.5) | |
| Pharyngitis | 361 (25.8) | 140 (20.1) | |
| Dengue fever | 135 (9.6) | 45 (6.5) | |
| Tonsillitis | 118 (8.4) | 29 (4.2) | |
| Typhoid fever | 39 (2.8) | 36(5.2) | |
| Diarrhoea/Enteritis | 31 (2.2) | 27 (3.9) | |
| Leptospirosis | 2 (0.1) | 9 (1.3) | |
| Hepatitis | 3 (0.2) | 7 (1.0) | |
| Acute respiratory tract infection | 1 (0.1) | 1 (0.1) | |
| Other** | 20 (1.4) | 16 (2.3) |
* 2 cases missing age
**Other: Allergy, arthritis, clinical malaria, gastritis, lymphadenitis, measles, mumps, sinusitis, varicella.