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SUMMARY Various mammalian cells propagated in serum-free and chemically defined media yielded high titres of Venezuelan equine encephalomyelitis virus. Some difference in maximum titres was noted, depending upon the medium employed. Of the two serum-free media tested, lactalbumin hydrolysate medium was more effective than the chemically defined medium in supporting virus growth. The addi- tion of serum to serum-free cultures at the time of virus inoculation had a pro- nounced effect characterized by a delay followed by a burst of virus replication to very high titres. Thus, the degree of replication of Venezuelan equine encephalo- myelitis virus appeared to be influenced by a variety of unknown nutritional factors.

Replication of Venezuelan Equine Encephalomyelitis Virus in Suspension Cell Cultures Grown in Serum-free and Defined Media