Table 2.

Quantitative estimates of microbial biomass on kitchen coupons and bathrooms tiles

	Sample	Bacteria	Fungi
Sampling 1
Kitchen coupons	KC.1	2,300,000 ± 900,000	251,000 ± 94,000
	KC.2	3,800,000 ± 200,000	122,000 ± 5,000
	KC.3	229,000 ± 65,000	17,000 ± 5,000
	KC.4	1,200,000 ± 140,000	226,000 ± 23,000
	Average	1,900,000	154,000
Bathroom tiles	BT.1	36,000 ± 2,000	8,500 ± 4,000
	BT.2	26,700 ± 200	10,200 ± 3,000
	BT.3	200 ± 6	800 ± 500
	Average	21,000	6500
Sampling 2
Kitchen coupons	KC.5	574,000 ± 46,000	51,300 ± 8,000
	KC.6	887,000 ± 25,000	52,200 ± 6,000
	KC.7	2,870,000 ± 1,500,000	60,900 ± 9,000
	KC.8	404,000 ± 5,000	17,900 ± 6,000
	KC.9	4,620,000 ± 40,000	25,700 ± 2,000
	KC.10	378,000 ± 12,000	19,900 ± 8,000
	Average	1,622,000	38,000
Bathroom tiles	BT.4	780 ± 30	100 ± 80
	BT.5	4,900 ± 200	–a
	BT.6	7,800 ± 600	500 ± 100
	BT.7	3,700 ± 100	2200 ± 22,000
	Average	4,300	700

Reported as gene copies/cm² surface, rounded to three significant figures

^aBelow detection limit