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Table 2 Sensitivity of PCR for the detection of Chlamydia trachomatis in synovial fluid depending on DNA extraction method and primer system used

From: Detection of Chlamydia trachomatis-DNA in synovial fluid: evaluation of the sensitivity of different DNA extraction methods and amplification systems

Amplification system

1 Alkaline Lysis

2 Qiaex II gel extraction kit®

3 Chelex®

4 Qiagen Tissue kit®

5 Qiagen Stool kit®

 

(C. trachomatisEB/ml SF)

(C. trachomatisEB/ml SF)

(C. trachomatisEB/ml SF)

(C. trachomatisEB/ml SF)

(C. trachomatisEB/ml SF)

PCR 1

1

0.1

100

1

1

C. trachomatis

(0.1-10)

(1-100)

(10-100)

(1-10)

(1-100)

omp 1

M1

M 1

M 100

M 1

M 100

Statistical analysis

* 2,5

* 1,4

 

* 2

* 1

PCR 2

10

1000

1000

10

10

C. trachomatis

(10)

(1-1000)

(100-1000)

(0.1-10)

(10-1000)

omp 1

M 10

M 1000

M 1000

M10

M 10

Statistical analysis

* 2

* 1,4,5

 

* 2

* 2

PCR 3

1

100

1000

1

100

Plasmid

(0.1-10)

(10-1000)

(1000)

(1-10)

(10-1000)

 

M 1

M 100

M 1000

M 1

M 100

Statistical analysis

* 2,3,5

* 1,3,4,5

* 1,2

* 2,3

* 1,2,4

PCR 4

1

10

1000

10

100

16 sRNA

(0.1-10)

(10-1000)

(10-1000)

(0.1-10)

(10-100)

 

M 1

M 100

M 1000

M 10

M 10

Statistical analysis

* 2,3,5

* 1,4,5

* 1

* 2,3

* 1,2

LCR

10

1

10000

10

100

Plasmid

(0.1-100)

(1-100)

(100-1000)

(10- 100)

(1-1000)

 

M 10

M 100

M 1000

M 10

M 100

Statistical analysis

* 2

* 1,3,4,5

* 2

* 2

* 2

  1. Synovial fluid was spiked with isolated C. trachomatis- elementary bodies (C. trachomatis EB) per ml synovial fluid (SF) ranging from 10,000 C. trachomatis EB/ml SF to 0.1 C. trachomatis-EB/ml SF in 10-fold decreasing concentrations. Five independent repeats of each serial dilution was performed (n = 5) for each DNA extraction method and amplification system evaluated. The range of detection limits of each method is given in brackets, median (M) of serial dilutions given below. Sensitivity was defined as reproducibly detected lowest number of detected C. trachomatis EB/ml SF. Statistical analysis: significant results are indicated in order of method compared. Statistical significant results are indicated by *, method compared with is indicated by number (P < 0.05). LCR = ligase chain reaction; omp-1 = major outer membrane protein.