Table 2.

Fold change in abundance and taxa assignments of gut bacteria in GIMS-F colon fluid exposed to arsenic compared to no exposure control at week 3 and 4.

Bacteria	Week 3				Week 4
	Test Material				Test Material
	Arsenate	Pesticide-Impacted	USGS	NIST 2710 A	Arsenate	Pesticide-Impacted	USGS	NIST 2710 A
Akkermansia	1.20	1.16	1.27	1.32	1.13	1.14	1.37	1.42
Bacteroides	1.25	1.65	1.01	1.12	−1.02	1.40	−1.04	−1.07
Bilophila	−1.74	−1.68	−1.90	−1.97	−1.33	−1.44	−1.75	−2.57
Clostridiaceae g.__	−3.10	−4.23	−4.45	−4.03	1.34	−1.14	−1.30	−1.40
Clostridiaceae g. other	X	X	X	X	ND	ND	ND	ND
Clostridium	3.15	2.09	2.94	9.90	1.30	−1.60	−1.72	−1.14
Enterobacteriaceae g.__	1.00	−1.28	1.13	−1.03	1.00	−1.23	−1.10	−1.10
Enterococcus	1.03	−2.33	−1.46	−1.46	1.17	−2.00	−1.71	−1.71
Lachnospiraceae g.__	1.15	−1.28	1.01	1.04	1.03	−1.56	−1.12	−1.47
Lactobacillales f.__ g.__	ND	ND	ND	ND	1.60	X	X	X
Parabacteroides	X	4.33	−3.75	X	X	6.20	1.00	X
Peptostreptococcaceae g.__	−1.09	−1.17	1.14	1.54	1.25	−1.22	−1.08	−1.04
Proteus	−26.67	−16.00	−2.29	−40.00	−1.46	−1.79	−2.00	−2.39
Rikenellaceae g.__	X	−3.70	X	X	X	−4.40	X	X
Sutterella	−1.29	−1.15	−1.83	−2.54	1.41	1.19	−0.19	−1.87

“ND” is microbe not detected in no exposure and arsenic-exposed groups. “X” is microbe became extinct in arsenic-treated group.