TABLE 5.

Antibody titers to C. ruminantium by IFAT of laboratory-infected cattle (group 5)

Animal no.	Preexposure titer	Time of first detection of antibodies	Reciprocal IFAT antibody titera for following period (wk):
			5	10	15	20	30	40	50
103	<20	Wk 2	2,560	1,280	320	160	80	80	40
108	<20	Wk 5	160	40	40	20	20	10	≤10
110	<20	Wk 4	80	40	20	10	10	≤10	≤10
112	<20	Wk 4	320	640	NDb	20	10	10	10
114	<20	Wk 4	640	160	ND	40	20	10	10

^aA cutoff reciprocal titer of 40 (2 × 1:20, the background titer) was decided after testing preinfection samples from each animal. 

^bND, not done.