Susceptible recipients challenged with SSBP/1 and development of scrapie in offspring.

CD = caesarean derivation and hand rearing, NB = natural birth, reared by recipient ewe.
*After SSBP/1 = number of days till death following challenge with SSBP/1.
**(scr) – embryo donor later developed natural scrapie.
***Where two progeny indicated per recipient, these developed in utero together and born as “twins”. Deaths are from scrapie (Death scrapie) or other causes (Death other) and given in days of age (d).
#Incubation period in days (dy) when strain typed in tg 338 mice (SD).