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Table 4 Results of the real-time multiplex PCR assay compared to the traditional cultural method for the detection of Salmonella from artificially contaminated chicken skin and chicken meat samples

From: Development of a real-time multiplex PCR assay for the detection of multiple Salmonella serotypes in chicken samples

Food Type

Salmonella serotype

Estimated CFU by plating

ISO 6579

Real-time multiplex PCR

    

aceK

fliC

sefA

sdf

Chicken skin

Enteritidis

0

-a

-

-

-

-

  

3

+b

+ (28.14)

-

+ (27.70)

+ (26.99)

  

32

+

+ (24.94)

-

+ (25.15)

+ (24.51)

  

168

+

+ (22.52)

-

+ (22.32)

+ (21.68)

Chicken meat

Enteritidis

0

-

-

-

-

-

  

5

+

+ (20.58)

-

+ (20.09)

+ (19.88)

  

36

+

+ (20.20)

-

+ (19.96)

+ (19.57)

  

222

+

+ (19.67)

-

+ (19.67)

+ (19.05)

Chicken skin

Typhimurium

0

-

-

-

-

-

  

3

+

+ (24.12)

+ (23.46)

-

-

  

34

+

+ (22.18)

+ (21.00)

-

-

  

257

+

+ (21.95)

+ (19.57)

-

-

Chicken meat

Typhimurium

0

-

-

-

-

-

  

7

+

+ (23.19)

+ (22.75)

-

-

  

54

+

+ (21.39)

+ (21.19)

-

-

  

305

+

+ (20.84)

+ (20.42)

-

-

Chicken skin

Kentucky

0

-

-

-

-

-

  

6

+

+ (26.28)

+ (25.94)

-

-

  

48

+

+ (24.25)

+ (23.70)

-

-

  

280

+

+ (22.12)

+ (21.41)

-

-

Chicken meat

Kentucky

0

-

-

-

-

-

  

5

+

+ (23.55)

+ (22.33)

-

-

  

52

+

+ (21.15)

+ (19.93)

-

-

  

277

+

+ (20.57)

+ (19.49)

-

-

Chicken skin

Bredeney

0

-

-

-

-

-

  

6

+

+ (22.46)

-

-

-

  

60

+

+ (21.58)

-

-

-

  

397

+

+ (22.00)

-

-

-

Chicken meat

Bredeney

0

-

-

-

-

-

  

9

+

+ (22.37)

-

-

-

  

75

+

+ (21.69)

-

-

-

  

338

+

+ (22.23)

-

-

-

  1. CT values, in parentheses, are means of triplicates at a fixed threshold.
  2. a – = Salmonella negative by the method.
  3. b + = Salmonella positive by the method