No infectivity was shown in these tests of fetal calf serum.
Cellular invasion can be duplicated in vitro with polarized epithelial cell monolayers, and parasites ' activated ' to acquire infectivity.
pathogenesis experiment have now shown dorsal root ganglia to carry high infectivity (see vol.
scrapie infectivity.
Parasite infectivity to hybridizing host species: a link between hybrid resistance and allopolyploid speciation?