Validation of Inactiviation:
Confluent monolayers of Vero cells were infected with undiluted to 10
-4 dilutions of inactivated virus stock in four replicates and incubated for a period of 7 days. Active Rubella virus stock of the same lot and mock-infected Vero cells were included as positive and negative controls, respectively, for the assay. Cultures were incubated for a period of 7 days, and examined microscopically for the evidence of virus-specific CPE. The culture supernatant of active and inactivated virus were tested by HA using day old chick RBC. Only the active virus culture supernatant was positive for HA.This lot of inactivated Rubella virus stock, undiluted to 10
-4 dilutions, did not yield any infectious virus. The active virus stock of the same lot yielded infectious virus up to a 10
-6 dilution.