Table 4.

Proportions of contamination, by source, estimated by the three MST setups: without background (WB-MST); with a local background (LB-MST); and with a background selected through clustering analysis (DM-MST).

Source	MST setup	Proportion (%)	Std	No of OTUs (n)	No of Accurate OTUs (n)
Background	WB-MST	-	-	-	-
Background	LB-MST	98.6	0.016	586	537
Background	DM-MST	97.5	0.031	561	488
Dog	WB-MST	63.9	0.201	264	41
Dog	LB-MST	0	0	–	–
Dog	DM-MST	0	0	–	–
Horse	WB-MST	0	0	–	–
Horse	LB-MST	0.124	0.015	37	2
Horse	DM-MST	0.267	0.007	46	8
Sewage	WB-MST	10.4	0.069	309	39
Sewage	LB-MST	1.21	0.023	289	130
Sewage	DM-MST	2.14	0.021	309	140
Unknown	WB-MST	25.7	0.221	420	210
Unknown	LB-MST	<0.10	0.006	201	8
Unknown	DM-MST	<0.10	0.008	199	13