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Table 3 Type of bacteria and bacterial load in donated human milk samples

From: Comparison of bacterial profiles in human milk from mothers of term and preterm infants

Bacteria

Term (n = 75)

Preterm (n = 139)

P-value

n

Prevalence (%)

n

Prevalence (%)

Staphylococcus epidermidis

59

78.7%

122

87.8%

0.079

Staphylococcus lugdunensis

13

17.3%

47

33.8%

0.01*

Staphylococcus aureus

18

24.0%

31

22.3%

0.78

Pseudomonas fluorescens

11

14.7%

39

28.1%

0.027*

Acinetobacter baumannii

1

1.3%

4

2.9%

0.66

Enterococcus faecalis

-

-

31

22.3%

 < 0.001***

Enterobacter aerogenes

-

-

23

16.5%

 < 0.001***

Stenotrophomonas maltophilia

3

4.0%

25

18.0%

0.003**

Pseudomonas sp.

3

4.0%

3

2.2%

0.43

Pseudomonas putida

6

8.0%

1

0.7%

0.008**

Pseudomonas aeruginosa

2

2.7%

-

-

0.12

Serratia liquefaciens

7

9.3%

-

-

 < 0.001***

Serratia sp.

-

-

2

1.4%

0.77

Pantoea agglomerans

4

5.3%

-

-

0.014*

Raoultella ornithinolytica

1

1.3%

2

1.4%

1

Acinetobacter johnsonii

3

4.0%

1

0.7%

0.13

Acinetobacter sp.

1

1.3%

1

0.7%

1

Acinetobacter ursingii

3

4.0%

5

3.6%

1

Streptococcus agalactiae

-

-

2

1.4%

0.77

Escherichia coli

1

1.3%

-

-

0.35

α-streptococcus

2

2.7%

1

0.7%

0.28

Klebsiella oxytoca

9

12.0%

15

10.8%

0.79

Klebsiella pneumoniae

-

-

1

0.7%

1

Enterobacter sp.

3

4.0%

1

0.7%

0.13

Bacillus cereus

3

4.0%

-

-

0.042*

Bacillus subtilis

1

1.3%

-

-

0.35

Rhizobium radiobacter

-

-

1

0.7%

1

Staphylococcus warneri

1

1.3%

1

0.7%

1

Staphylococcus haemolyticus

1

1.3%

-

-

0.35

  1. Bacterial load refers to the number of batches of milk containing certain bacteria, that were detected out of the total batches of donated human milk (HM)
  2. In some batches, two or more bacteria were detected
  3. P-values were shown in the table for the Chi-squared test or Fisher’s exact test results of the bacterial load for HM batches from term and preterm mothers
  4. *: < 0.05, **: < 0.01. ***: < 0.001