TABLE 2.

Survival of guinea pigs after immunization with the human cell-free anthrax vaccine or Sterne live-spore vaccine^a

Challenge isolate	Vaccine efficacy (% survival)
	Saline	Cell-free vaccine	Saline	Sterne spore vaccine
Vollum	0	100
Vollum 1B	13	100	40	100
Amesb	17	0	0	100
17T5c	0	17	0	88
NHd	0	33	0	100
VHe	0	50	17	100

^aData from reference 56.

^bAmes isolated from a cow; United States 1980.

^c17T5 isolated from a Kudu; South Africa 1957.

^dNH isolated from a human case; New Hampshire 1957.

^eVH isolated from a human case; South Africa 1952.