Table 3

Colonization Study: Comparison of single antimicrobial resistance and a colonization success of E. coli clones from the rectal content of 5 piglets.

resistance to

ampicillin

streptomycin

spectinomycin

tetracycline

sulfamethoxazole

yes

no

yes

no

yes

no

yes

no

yes

no

number of clones

n = 10

n = 34

n = 13

n = 31

n = 9

n = 35

n = 30

n = 14

n = 15

n = 29

maximum numbers ^a

11 (1/19)*

2 (1/20)

2 (1/19)

2 (1/20)

2 (1/19)

2 (1/20)

2 (1/20)

1 (1/20)

2 (1/19)

2 (1/20)

total numbers in all samples ^b

16 (1/199)

2 (1/106)

2 (1/48)

4 (1/199)

4 (1/48)

2 (1/199)

4 (1/199)

2 (1/79)

4 (1/199)

2 (1/106)

numbers of piglets ^c

2 (1/5)

1 (1/5)

1 (1/5)

2 (1/5)

1 (1/5)

2 (1/5)

1.5 (1/5)

2 (1/4)

1 (1/5)

2 (1/5)

time points ^d

2 (1/8)

1 (1/6)

1 (1/6)

2 (1/8)

1 (1/6)

1 (1/8)

1.5 (1/8)

1 (1/4)

1 (1/8)

1 (1/6)

^a maximum numbers of isolates of one clone in one sample, as we included 20 isolates of one sample there was a theoretical range between 0 and 20 isolates per clone

^b total numbers including all isolates from all samples of one clone, as we included 800 isolates from all piglets over the whole eight week period and detected 44 clones a theoretical range between 1 and 757.

^c numbers of colonized piglets with a specific clone, as we included five piglets a theoretical range between 0 and 5

^d numbers of time points of the detection of a specific clone, as we sampled over an eight week period a theoretical range between 1 and 8

* median (min/max)

Schierack et al. Gut Pathogens 2009 1:18   doi:10.1186/1757-4749-1-18