The Effectiveness of Anti-R. equi Hyperimmune Plasma against R. equi Challenge in Thoroughbred Arabian Foals of Mares Vaccinated with R. equi Vaccine

Table 2

Anti-R. equi antibody ELISA titer of vaccinated and unvaccinated mares and challenged foals.

Mare group	Mare number	ELISA titer at birth	Foal group	Foal number	ELISA titer after challenge
					Day 0	Day 10	Day 20
Vaccinated	1	1/12800	Vaccine + HI plasma	1	1/800	1/1600	1/1600
	2	1/6400		2	1/100	1/400	1/800
	3	1/3200		3	1/800	1/1600	1/1600
	4	1/6400		4	1/400	1/800	1/800
Unvaccinated	5	Negative	Control	5	0	1/200	*
	6	1/200		6	0	Negative	1/200
	7	Negative		7	0	*	*
	8	Negative		8	0	Negative	1/200

∗Because foals died, ELISA titer was not measured on these days.