Table 2 Search terms used to search MEDLINE

S1 (MH “Cholera”) OR “cholera” OR (MH “Cholera Toxin”)

S2 (MH “Diagnosis”) OR “diagnosis” OR (MH “Early Diagnosis”) OR (MH “Diagnosis, Differential”)

S3 (MH “Limit of Detection”) OR “detection”

S4 (MH “Diarrhea+”) OR “diarrhoea”

S5 (MH “Water”) OR “water” OR (MH “Drinking Water”) OR (MH “Water Pollution”) OR (MH “Water Wells”) OR (MH “Water Supply”) OR (MH “Water Quality”) OR (MH “Waste Water”)

S6 AB choler*

S7 AB diagnos* OR AB detect*

S8 AB stool OR AB diarrh* OR AB water

S9 S2 OR S3

S10 S4 OR S5

S11 S1 AND S9 AND S10

S12 S6 AND S7 AND S8

S13 S11 OR S12

S14 Limit S13 to (yr = “1990-current”)