Table 4. Characteristics of household contacts with Shigella infections for pediatric shigellosis patients and community controls, rural Bangladesh.
| Characteristic | Patient contacts |
Control contacts |
p value* | |||
|---|---|---|---|---|---|---|
| No. (%) | Total no. | No. (%) | Total no. | |||
| Contacts infected | 31 (37) | 83 | 1 (1) | 77 | <0.0001 | |
| Contacts with symptomatic infections† | 6 (7) | 83 | 0 | 77 | 0.03 | |
| Contacts with infection detected on visit 1 of surveillance | 13 (16) | 83 | 1 (1) | 77 | 0.0013 | |
| Contacts with infection detected on visits other than visit 1 of surveillance | 18 (22) | 83 | 0 | 77 | ||
| Infected contacts by sex | ||||||
| M | 18 (51) | 35 | 0 | 31 | 0.44 | |
| F | 13 (27) | 48 | 1 (2) | 46 | ||
| Infected contacts by relation to patient or control child | ||||||
| Mother | 9 (35) | 26 | 0 | 26 | 0.09 | |
| Father | 8 (53) | 15 | 0 | 16 | ||
| Brother | 6 (55 | 11 | 0 | 12 | ||
| Sister | 2 (17) | 12 | 1 (10) | 10 | ||
| Other relative | 6 (32) | 19 | 0 | 13 | ||
| Infected contacts by Shigella species and serotype | ||||||
| S. flexneri | 20 (65) | 31 | 0 | 1 | 0.63 | |
| S. flexneri 1b | 2 (6) | 31 | 0 | 1 | ||
| S. flexneri 1c | 3 (10) | 31 | 0 | 1 | ||
| S. flexneri 2a | 12 (39) | 31 | 0 | 1 | ||
| S. flexneri 3a | 3 (10) | 31 | 0 | 1 | ||
| S. flexneri 4X | 0 | 31 | 0 | 1 | ||
| S. sonnei | 9 (29) | 31 | 1 (100) | 1 | ||
| S. boydii | 2 (6) | 31 | 0 | 0 | ||
| S. boydii 7 | 1 (3) | 31 | 0 | 0 | ||
| S. boydii | 1 (3) | 31 | 0 | 0 | ||
| S. dysenteriae | 0 | 31 | 0 | 0 | ||
*By Fisher exact test. †Defined as a Shigella infection with diarrhea, vomiting, or blood in stool during previous 48 hours.