TABLE 3.

Inoculum plate counts and numbers of positive (YF) reactions for a marine coculture inoculated in the Colilert-18 system at various inoculum concentrations and in several seawater dilutions

Inoculum dilution	Result for seawater at indicated dilution
	Undiluted			1:5			1:10			1:20
	Inoculum plate count (CFU ml−1)a	Positive (YF) wellsb		Inoculum plate count (CFU ml−1)	Positive (YF) wells		Inoculum plate count (CFU ml−1)	Positive (YF) wells		Inoculum plate count (CFU ml−1)	Positive (YF) wells
		L	S		L	S		L	S		L	S
10−5	TNTC	49	48	TNTC	49	48	TNTC	49	48	TNTC	49	48
10−6	312	49	48	349	49	48	297	49	48	171	0	0
10−7	29	49	48	45	49	46	33	49	18	24	0	0
10−8	4	49	48	7	48	9	5	48	43	2	0	1
10−9	2	46	0	0	38	1	1	0	0	0	0	0

^aTNTC, too numerous to count.

^bNumber of YF Colilert wells per test. L, large wells (1.6 ml); S, small wells (120 μl).