Abstract
Summary and Conclusion
1) Use of a HeLa cell system, using HeLa cell-adapted ECHO-9 virus, has definite value in studying neutralizing antibody titers during an ECHO-9 epidemic. 2) 228 cases of CNS disease reported to our Department during summer and fall of 1957 were listed as ECHO-9 virus infections on the basis of clinical, epidemiological and/or laboratory findings. Laboratory evidence for support of the diagnosis was available in 214 cases.
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