Abstract
Summary
Five additional types of Coxsackie virus Group A have been assigned numbers, Types 20-24. Strains of all types with the exception of Type 23 are isolated readily in suckling mice. Type 23, which is the infectious agent presently known as ECHO 9, may be more easily isolated from the fecal specimen when tissue cultures are used for isolation. Types 20, 21 and 23 were cytopathogenic for one or more types of tissue in cultures; Types 22 and 24 did not induce damage on any of the cell types used.
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