Transmission scheme of TSEs in cynomolgus macaques and C57BL/6
mice. Open frames, natural or accidental disease; hatched frames,
experimental disease in primates; stippled frames, experimental disease
in mice. IC, intracerebral inoculation; IV, intravenous inoculation;
bh, brain homogenate; mth, month. The incubation periods
indicated on the arrows each correspond to one inoculated macaque. One
macaque was inoculated with British vCJD (25 months), and the other was
inoculated with the first French case of vCJD (30 months). The
incubation periods of the i.c. titration are as follows:
10−1 dilution: 20 and 21 months; 10−2
dilution: 28 months; 10−3 dilution: 33 months;
10−5 dilution: 38 months (the second macaque inoculated
presents slight behavioral changes at 48 months after inoculation).