Table 1.

Weekly IFA titres of plasma from calves inoculated with cryopreserved stabilate

Inoculum	Calf	d.p.i.
		0	7	14	21	28	35	42
DH82	A17*	−†	−	−	−	−	−	−
Arkansas	A11*	−	20	64	64	64	64	64
	A14‡	−	128	128	128	64	64	64
St Vincent	A12*	−	64	64	64	64	64	64
	A15‡	−	64	64	64	64	64	64
91HE17	A13*	−	64	64	64	64	64	64
	A16‡	−	256	512	64	128	64	64

^*Splenectomized.

^†Negative at 1 : 20 dilution.

^‡Spleen-intact.