. 2013 Nov;132(5):e1227–e1235. doi: 10.1542/peds.2013-1687

TABLE 1.

Proportions of Human Milk Samples With Each Bacteria Type Isolated

Bacteria Types	Prevalence, n (%)^a
	Internet Purchased Samples, n = 101	Milk Bank Samples, n = 20	P
Gram-negative bacteria	73 (72)	7 (35)	.003
Coliforms (lactose-fermenting Gram-negative bacteria)	44 (44)	5 (25)	.14
Salmonella sp	3 (3)	0 (0)	.58^b
Staphylococcus sp	64 (63)	5 (25)	.002
Streptococcus sp	36 (36)	4 (20)	.20
No detectable growth	9 (9)	5 (25)	.07

^{^a}

>24 CFU/mL.

^{^b}

Calculated with Fisher’s exact test.