We detected V. cholerae O1 in stool of 6.2% (1604/25 958) of patients. Among those younger than 5 years, 2.1% (253/11 968) of diarrheal cases were positive for cholera, with 72.3% (183/253) of cases occurring in the under-2-year age and 27.7% (70/253) in 2–4-year age group. Among those who were older, 9.5% (1351/14 253) of cases were positive for cholera, of which 13.4% (181/1351) were aged 5–17 years, 67.4% (910/1351) were 18–45 years, and 19.2% (260/1351) were 46 years or older. The age distribution of cholera cases was qualitatively similar among the different Divisions and 53% were male. The majority (82.4%) of cholera cases had primary or no formal schooling (which included children and those who did not complete primary school). Most cholera cases had some or severe dehydration (78%), vomiting (75%), and abdominal cramps (71%). 
Approximately 30% had eaten food from roadside vendors, 14% had eaten food in large gatherings, while 17.5% had neighbors with diarrhea in the week prior to illness (Table 1).
Table 1. Distribution of demographic, clinical factors and history of exposures of V. cholerae culture positives by divisions, May 2014-June 2018, Bangladesh
Characteristics Divisions  
Overall n(%), N=1604 Dhaka n(%), N=405 Chittagong n(%), N=572 Barisal n(%), N=181 Sylhet n(%), N=133 Khulna n(%), N=200 Rajshahi, n(%), N=94 Rangpur n(%), N=19  
Age (years)  
<5 253 (15.8) 48 (11.9) 63 (11.0) 40 (22.1) 37 (27.8) 35 (17.5) 15 (15.9) 15 (78.9)  
5-17 181 (11.3) 48 (11.8) 70 (12.2) 19 (10.5) 20 (15.0) 17 (8.5) 7 (7.5) 0 (0.0)  
18-45 910 (56.7) 237 (58.5) 346 (60.5) 94 (51.9) 61 (45.9) 117 (58.5) 52 (55.3) 3 (15.8)  
>46 260 (16.3) 72 (17.8) 93 (16.3) 28 (15.5) 15 (11.3) 31 (15.5) 20 (21.3) 1 (5.3)  
Sex (Male) 853 (53.2) 227 (55.9) 295 (51.6) 84 (46.4) 71 (53.4) 105 (52.5) 58 (61.7) 13 (68.4)  
Education status  
No formal schooling (child, not completed primary) 630 (39.3) 138 (34.1) 208 (36.4) 70 (38.7) 78 (58.7) 93 (46.5) 28 (29.8) 15 (78.9)  
Primary 691 (43.1) 191 (47.2) 281 (49.1) 60 (33.2) 50 (37.6) 64 (32.0) 43 (45.7) 2 (10.5)  
Secondary and above 28 (17.6) 76 (18.8) 83 (14.5) 51 (28.2) 5 (3.8) 43 (21.5) 23 (24.5) 2 (10.5)  
Occupation  
Service holder 290 (18.1) 127 (31.3) 130 (22.7) 8 (4.4) 4 (3.0) 13 (6.5) 7 (7.5) 1 (5.3)  
Agricultural worker 84 (5.2) 12 (2.9) 14 (2.5) 8 (4.4) 16 (12.0) 24 (12.0) 10 (10.6) 0 (0.0)  
Businessman 104 (6.5) 26 (6.4) 35 (6.1) 12 (6.6) 3 (2.3) 14 (7.0) 13 (13.8) 1 (5.3)  
Housewife 456 (28.4) 96 (23.7) 156 (27.3) 72 (39.8) 33 (24.8) 72 (36.0) 26 (27.7) 1 (5.3)  
Day laborer 131 (8.2) 32 (7.9) 70 (12.2) 5 (2.8) 8 (6.0) 6 (3.0) 10 (10.6) 0 (0.0)  
Students & unemployed 254 (15.8) 51 (12.6) 94 (16.4) 36 (19.9) 28 (21.1) 32 (16.0) 12 (12.8) 1 (5.3)  
Baby/Child (up to 10 years) 275 (17.1) 55 (13.6) 73 (12.8) 40 (22.1) 39 (29.3) 37 (18.5) 16 (17.0) 15 (78.9)  
Others 10 (0.6) 6 (1.5) 0 (0.0) 0 (0.0) 2 (1.5) 2 (1.0) 0 (0.0) 0 (0.0)  
Clinical characteristics                  
Fever 804 (50.1) 293 (72.4) 235 (41.1) 49 (27.1) 81 (61.0) 106 (53.0) 30 (31.6) 10 (52.6)  
Vomiting 1207 (75.3) 363 (89.6) 414 (72.4) 139 (76.8) 72 (54.1) 133 (66.5) 72 (76.6) 14 (73.7)  
Dehydration status  
None 358 (22.3) 26 (6.4) 197 (34.4) 48 (26.5) 41 (30.8) 21 (10.5) 24 (26.5) 1 (5.3)  
Some 875 (54.6) 170 (41.9) 280 (48.9) 118 (65.2) 79 (59.4) 161 (80.5) 62 (65.9) 5 (26.3)  
Severe 371 (23.1) 209 (51.6) 95 (16.6) 15 (8.3) 13 (9.8) 18 (9.0) 8 (8.5) 13 (68.4)  
Abdominal cramp 1141 (71.2) 352 (86.9) 366 (63.9) 152 (83.9) 75 (56.4) 121 (60.5) 72 (76.6) 3 (15.8)  
Behavioral Exposures  
Water treatment habit (Boiled) 130 (8.1) 67 (16.5) 49 (8.6) 7 (3.9) 1 (0.8) 2 (1.0) 4 (4.3) 0 (0.0)
Taken Food from road side vendors 485 (30.2) 68 (16.8) 216 (37.8) 48 (26.5) 35 (26.3) 75 (37.5) 43 (45.7) 0 (0.0)
Taken of food from large gatherings 226 (14.1) 21 (5.2) 132 (23.1) 12 (6.6) 17 (12.8) 27 (13.5) 17 (18.1) 0 (0.0)
HH members suffered from diarrhea during last week 158 (9.9) 21 (5.2) 92 (16.1) 13 (7.2) 4 (3.0) 15 (7.5) 13 (13.8) 0 (0.0)
Neighbors had diarrhea during last week 280 (17.5) 18 (4.4) 132 (23.1) 90 (49.7) 14 (10.5) 18 (9.0) 7 (7.5) 1 (5.3)