KELEN, A E SPORADIC OCCURRENCE OF ECHO VIRUS TYPES 27 AND 31 ASSOCIATED WITH ASEPTIC MENINGITIS IN ONTARIO. [electronic resource] - Canadian Medical Association journal Dec 1964 - 1266-8 p. digital Publication Type: Journal Article ISSN: 0008-4409 Subjects--Topical Terms: CanadaCerebrospinal FluidEnterovirusEnterovirus B, HumanEnterovirus InfectionsEpidemiologyFecesHumansMeningitisMeningitis, AsepticMeningitis, ViralOntarioSeasonsSerologic Tests