Simian rotavirus SA-11, experimentally seeded, was recovered from raw
domestic sewage by a two-step concentration procedure, using filtration
through a positively charged microporous filter (Zeta Plus 60 S) followed
by ultracentrifugation, effecting an 8,000-fold concentration. By this
method, a mean recovery of 81% 7.5 of the SA-11 virus, was achieved.
