TABLE 2.

Protective efficacy of Md5BAC ΔmeqΔpp38 in SPF chickens

Vaccinationa	Challengeb	Tumors (%)c	Lesions (%)d	PIe
CVI988/Rispens	Md5BAC	1/13 (7.7)	1/13 (7.7)	88.2
Md5BAC ΔmeqΔpp38	Md5BAC	0/13 (0)	0/13 (0)	100
None	Md5BAC	4/20 (20)	13/20 (65)	N/Af
None	None	0/12 (0)	0/12 (0)	N/Af

^aChickens were vaccinated with 2,000 PFU of the indicated viruses.

^bChickens were challenged with 500 PFU Md5BAC at day 5 post-vaccination. “None” means no virus inoculation.

^cTumors (%) = incidence of Marek’s disease specific gross tumors.

^dIncidence of Marek’s disease-specific gross lesions.

^ePI = protective index.

^fN/A = not applicable.