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Biological Sciences Laboratories, U.S. Army Biological Defense Research Centre, Fort Detrick, Frederick, Maryland, 21701
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 addition of serum to serum-free cultures at the time of virus inoculation had a pronounced effect characterized by a delay followed by a burst of virus replication to very high titres. Thus, the degree of replication of Venezuelan equine encephalomyelitis virus appeared to be influenced by a variety of unknown nutritional factors.
Received 29 August 1970;
accepted 30 October 1970.
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