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Table 2 Quantification of Mycobacterium cells by microscopy and by qPCR

From: Quantification of Mycobacterium avium subspecies in pig tissues by real-time quantitative PCR

Strain/sample

Microscopy cells ml-1

qPCR cell equivalents* of mycobacterial DNA ml-1

M. avium ATCC 25291

1 × 106

2 × 106 (n = 2)

M. avium ATCC 25291

1 × 108

6 × 107 (n = 2)

M. avium Austria 9646/4

5 × 108

2 × 108

M. avium Austria 9972/6

7 × 109

3 × 109

M. avium Netherlands 2

2 × 109

9 × 108

M. avium ATCC 25291 + 0.1 g of liver

1 × 104

7 × 103

M. avium ATCC 25291 + 0.1 g of liver

1 × 106

7 × 105

  1. *Cell equivalent calculated based on the assumed single copy number of 16S rRNA as information regarding the exact number of 16S rRNA in M. avium subspecies hominissuis is not available so far.