Viruses, Serums, Toxins, and Analogous Products; Encephalomyelitis Vaccine, Eastern, Western, and Venezuelan, Killed Virus

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We are amending the standard requirement for Encephalomyelitis Vaccine, Eastern and Western, Killed Virus, by specifying requirements for killed Venezuelan equine encephalomyelitis vaccines and revising the standard potency test for Eastern and Western equine encephalomyelitis vaccines. The amendments require the use of Vero 76 cells in the test to evaluate the potency of Encephalomyelitis Vaccine, Eastern, Western, and Venezuelan, Killed Virus, and establish minimum antibody titers which must be elicited by each of the indicated fractions, as determined by a plaque reduction, serum neutralization assay in which Vero 76 cells are used.