performed with animals. The strain of SFV used in this laboratory was the 
attenuated L10 derrivative, also the progenitor of the SFV/Helper expression 
system. 
Serologic testing revealed (Table 13) that eight of sixteen individuals were weakly 
seropositive at dilutions of 1:5 to 1:10 by the hemagglutination inhibition assay 
(HI), or by the more sensitive hemolysis-in-gel assay (HIG) (Vaananen, 1982). 
[474] 
Recombinant DNA Research, Volume 18 
