Table 3.

Plate and broth counts of M. tuberculosis in spleen and lungs of mice with chronic infections, when plate counts had no colonies

Organ with no colonies in plate counts*	No. of mice	Organ	Type of count†	Mean count	SD	95% confidence limits
Spleen & lungs	2	Spleen	Broth	3.728	0.708	-2.638	10.094
		Lungs	Broth	4.247	1.428	-8.580	17.073
Lungs only	7	Spleen	Plate	3.079	0.960	2.192	3.968
			Broth	4.347	0.823	3.586	5.108
		Lungs	Broth	4.202	0.624	3.625	4.778

* A count of <1.40 log₁₀ cfu/organ

^† Plate counts are log₁₀ cfu/organ: broth counts are log₁₀ probable number of bacilli/organ