Different prion disease phenotypes result from inoculation of cattle with two temporally separated sources of sheep scrapie from Great Britain

Table 4 Attack rate and mean incubation periods in mouse strains after transmission of ovine scrapie and bovine scrapie

	Mouse strains	RIII		C57Bl		VM
		AR	IP, SEM	AR	IP, SEM	AR	IP, SEM
Pre-1975 group	Pre-1975 pool	11/11	477, 9	17/17	562, 13	13/16	698, 17
	PG119/01	3/4	898, 56	1/8	726	1/6	741
	PG609/01	4/6	904, 21	0/20		0/20
	PG743/01	7/14	866, 45	1/8	785	2/9	754, 90
	PG959/01	5/13	801, 53	0/20		0/20
	PG749/01	8/13	937, 36	0/20		1/15	585
	PG1189/01	10/11	918, 14	6/19	769, 58	3/4	839, 8
Post-1990 group	Post-1990 pool	3/12	614, 20	4/18	603, 48	1/2	797
	PG116/01	7/16	587, 29	0/20		0/20
	PG920/01	13/16	576, 27	7/18	643, 46	0/20
	PG1063/01	0/20		1/14	728	5/8	776, 20

AR Attack rate (calculated as the proportion of mice that developed disease out of the total number of mice still alive at the first positive diagnosis)
IPMean incubation period [days]
SEM Standard error of mean [days]

ISSN: 1746-6148