ERVW-1 and infection: Plasma samples from Group B animals were also monitored for neutralizing antibody titers to VSV G. Ten-fold dilutions of plasma were tested for the ability to inhibit infection of CEM×174 cells by an env-deficient strain of SIV that was pseudotyped with either the Indiana or the New Jersey serotype of VSV G. While none of the animals had neutralizing antibody titers against either serotype at the time of the first boost (week 12), some non-specific inhibition of infectivity was observed at the lowest dilution of plasma tested (Figure 8).