TY - GEN AU - YOHN,D S AU - HAMMON,W M TI - ECHO-4 viruses: improved methods and strain selection for identification and serodiagnosis SN - 0037-9727 PY - 1998///1101 KW - Enterovirus B, Human KW - Serologic Tests KW - Viruses KW - ethnology N1 - Publication Type: Journal Article UR - https://doi.org/10.3181/00379727-105-26007 ER -