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Table 3 Structure and antibiotic resistance of the E. coli population in the stream in response to a rain event (χ2 test P < 0.001 ***α = 0.01).

From: Influence of hydrological conditions on the Escherichia coli population structure in the water of a creek on a rural watershed

 

E. coli p-group distribution

 

A

B1

B2

D

Timing (h)a

%

(n)

Numbers of antibiotic-resistantb

Antibiotic

Resistancec

(n)

%

(n)

hlyd

Numbers of antibiotic-resistantb

Antibiotic

Resistancec

(n)

%

(n)

O81e

Numbers of antibiotic-resistantb

Antibiotic resistancec(n)

%

(n)

Numbers of antibiotic-resistantb

Antibiotic

resistancec

(n)

-5 h

25%

(3)

2

AMX/CHL(1) CHL(1).

50%

(6)

0

4

CHL(4)

8%

(1)

0

0

nd

17%

(2)

0

nd

+6 h

56%

(22)***

14

AMX/TIC/CHL(5)

AMX/TIC/CHL/SXT/STR(1)

AMX/TIC/SXT/STR(1)

CHL(6)

CHL/TET(1)

15%

(6)***

1

3

CHL(3)

8%

(3)

0

2

CHL(2).

21%

(8)

4

AMX/TIC/SXT/STR(1) CHL(3)

+19 h

15%

(6)***

3

AMX/CHL(1)

AMX/TIC/CHL(1)

AMX/TIC(1)

74%

(29)***

21

9

TET(1) CHL(7) AMX/CHL/TET(1)

5%

(2)

0

2

CHL(2).

5%

(2)

1

CHL(1)

  1. nd: not detected
  2. n: numbers of isolates
  3. a Timing in relation to rainfall
  4. b E. coli isolates resistant to one or more antibiotics
  5. c AMX: amoxicillin; TIC: ticarcillin CHL: chloramphenicol; TET: tetracyclin; STR: streptomycin; SXT:trimethoprim + sulfamethoxazole
  6. d hly gene detection by PCR method
  7. e Serotype O81 detection by PCR method