Table 1 Parameter estimates for 3-parameter lognormal models fit to fecal shedding by flocks of ring-billed gulls inoculated with two mcr-1 positive strains of E. coli and environmental persistence of those strains.

From: Gulls as Sources of Environmental Contamination by Colistin-resistant Bacteria

Parameter

Estimate

Standard Error

95% Confidence Intervals

Flock shedding of E. coli strain M175 (Fig. 2)

a

43.35

8.45

24.74, 61.95

b

0.37

0.07

0.21, 0.53

x0

14.95

1.31

12.06, 17.84

Environmental persistence of E. coli strain M175 (Fig. 3)

a

44.74

8.04

26.84, 62.64

b

0.78

0.24

0.24, 1.32

x0

15.90

3.65

7.36, 23.62

Environmental persistence of E. coli strain POR1303 (Fig. 3)

a

22.72

3.25

15.47, 29.97

b

0.51

0.29

−0.14, 1.17

x0

5.72

1.33

2.75, 8.69

  1. Parameter a defines both the amplitude and area of distribution of the curve, b is the geometric standard deviation (scale parameter) that defines the skewness and peakedness of the curve, and x0 is the geometric mean (location parameter) that represents the peak mcr-1 positive E. coli load.
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