Table 3.

Weekly IFA titres of plasma from calves inoculated with active cultures of different E. chaffeensis strains

Inoculum	Calf	d.p.i.
		0	7	14	21	28	35	42
DH82*	A31	−†	−	−	−	−	−	−
	A32	−	−	−	−	−	−	−
Arkansas	A33	−	64	NA‡	NA	NA	NA	NA
	A34	−	64	32	64	128	128	128
St Vincent	A35	−	64	64	256	256	512	512
	A36	−	NA	NA	NA	NA	NA	NA
91HE17	A37	−	32	64	128	128	128	64
	A38	−	128	NA	NA	NA	NA	NA

^*Negative controls injected with uninfected host cells.

^†Negative at 1 : 20 dilution.

^‡NA, Not applicable due to calf mortality.