TABLE 3.

Absorbances for reactions containing different amounts of B. pertussis (strain Tohama I) and B. parapertussis (strain ATCC 15237)

No. of bacteriaa		A450/620b
B. pertussis	B. parapertussis	DFPOR1	DFPOR2	DFPOR3
1	107	0.03	2.2	2.25
10	107	1.2	2.3	2.1
100	105	2.25	2.35	2.4
103	103	2.3	2.15	2.25
105	100	2.15	1.95	2.1
107	10	2.4	1.6	2.35
107	1	2.25	0.25	2.05

^aCFU per reaction mixture. 

^bAverage of three readings.