TABLE 1.

IHA test results with various soluble antigens and rabbit hyperimmune sera produced against whole-cell antigens

Serovar (type of antigena)	Antibody titer against antigen of reference serovarb
	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
1
SE	20
BE	20
AE	10
2
SE		40
BE	20	40
AE
3
SE			160
BE			160
AE
4
SE				20
BE				20
AE				10
5
SE					80
BE					80
AE	10				20
6
SE						160
BE						80
AE					10	20
7
SE							160
BE							160
AE
8
SE								320
BE								80
AE								40
9
SE									320
BE									80
AE									40
10
SE	10									40
BE	20									40
AE
11
SE											40
BE									10		40
AE
12
SE												320
BE												80
AE
13
SE						20							40
BE						20							40
AE
14
SE														320
BE														160
AE
15
SE															160
BE															160
AE					20										40

^aSE, saline extract; BE, boiled extract; AE, autoclaved extract.

^bTiters are expressed as the reciprocals of the final dilutions of sera giving positive reactions.