Table 1.

Aggregate mean percentage plaque reductions at each dilution by vaccine treatment group

Vaccine treatment	n	Dilution
		1 : 40	1 : 80	1 : 160	1 : 320	1 : 640	1 : 1280
MVA SC	26	90.86*	85.63	78.47	69.53	59.98	52.42
Dryvax	12	86.77	82.23	74.68	64.58	54.99	44.05
MVA IM	15	91.10*	86.61	78.79	71.34	60.09	47.26

*MVA SC and IM vaccinees have a significantly greater capability to neutralize variola virus at a 1 : 40 dilution compared with Dryvax vaccinees (P=0.02).