Abstract
An outbreak of echovirus type 11 (E-11) infection occurred among newborn babies in a hospital maternity unit in the summer of 1971. The results of studies are as follows: 1) Forty-one of 188 infants developed febrile illness with stomatitis during one and a half months from July to September. E-11 was isolated from stool specimens of 14 infants and two throat swabs. Antibody response to the virus was shown in all the 19 cases examined. Some of their mothers were suffering from subclinical infection. 2) The isolates were identified as a variant of E-11 which is not neutralized with antiserum against prototype E-11. Antiserum against the current virus neutralized both current and prototype viruses. 3) Sucrose gradient centrifugation of sera from infants revealed that the neutralizing antibody activity resided more predominantly in 19S than in 7S fractions. These antibodies reacted more specifically with the current strain than with the prototype Gregory strain.
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