TABLE 4.

Analysis of discordant results tested by the proportion method on solid medium^a

Drugb	No. of isolates with the following resultsc:
	MGIT R, BACTEC S	MGIT S, BACTEC R
INH		3 (1 R, 2 S)
RMP		4 (3 R, 1 S)
EMB
Expt 1	3 (2 S, 1 R)	7 (2 R, 5 S)
Expt 2	2 (2 S)	4 (3 R, 1 S)
SM	2 (2 R)	2 (2 R)

^aLJ medium was used at the Borstel and Milan centers, and Middlebrook 7H10 agar was used at the Zurich center. 

^bDrugs were used at the concentrations given in Table 2, footnote a. 

^cS, susceptible; R, resistant. Results obtained by the proportion method are given in parentheses after the number of strains with discordant results.