Commercial simian virus antisera that inhibit virus replication in primary monkey kidney cell cultures

The incorporation of hyperimmune serum into cell culture medium to control endogenous viral infections of primary cells can have a significant effect on the replication of other viruses. When commercial simian virus 5 or simian virus 40 antiserum was used with primary monkey kidney cell cultures, we found a significant inhibition (greater than 90%) of the replication of parainfluenza virus types 2 and 3 and reovirus type 1. In the viral diagnostic laboratory, the use of hyperimmune serum with primary monkey kidney cells may result in failure to isolate certain viruses if these cells are not first washed free of hyperimmune serum.