Table 2.

Samples from high-risk cohort by risk category and sample type.

Risk category	Sites	Baseline (2013)		Clinical episodes		End (2016)		Total samples
		No. swabs	No. subjects	No. swabs	No. subjects.	No. stools	No. subjects
Farm households	61	214	214	24	22	166	166	404
Animal health workers	3	30	30	7	6	23	23	60
Abattoir workers (pig slaughterers)	1	15	15	18	10	14	13	47
Poultry slaughterers	2	18	18	1	1	15	15	34
Rat traders	3	4	4	0	0	2	2	6
Total		281	281	50	39	220	219	551