Table 3 Search string used to search CINAHL

S1 AB choler*

S2 AB diagnos* OR AB detect*

S3 AB stool OR AB fec* OR AB faec* OR AB diarrh* OR AB water

S4 S1 AND S2 AND S3

S5 (MH “Cholera”) OR “cholera”

S6 (MH “Diagnosis”) OR “diagnosis” OR (MH “Diagnosis, Laboratory”) OR (MH “Early Diagnosis”)

S7 (MH “Diarrhea”) OR “diarrhoea”

S8 (MH “Feces”) OR “feces”

S9 stool

S10 (MH “Water”) OR (MH “Water Pollution”) OR (MH “Water Supply”) OR (MH “Water Microbiology”)

S11 S2 OR S6

S12 S7 OR S8 OR S9 OR S10

S13 S5 AND S11 AND S12

S14 S4 OR S13

S14 Limit S13 to Jan 1990-Sept 2017