BMC Infectious Diseases

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	+	+	+

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

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ISSN: 1471-2334

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