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Table 1 Example of a broth count from a chronic infection mouse

From: Mycobacterium tuberculosis from chronic murine infections that grows in liquid but not on solid medium

  Tubes
Dilution 1 2 3
10-5 0 0 0
10-4 0 0 0
10-3 0 + 0
10-2 + + +
10-1 + + +
100 + + +
  1. The mean fertile level (X) = no. of fertile cultures (10) / no. of cultures at each level (3). K = 0.760 from Table [6].
  2. Log pnb = X-K + log5 (organ in 5 ml) = 3.272