[Examination of the population of Riga for the presence in the blood of antibodies to ECHO viruses].
D000906:Antibodies; D000914:Antibodies, Viral; D000917:Antibody Formation; D029822:Enterovirus B, Human; D006801:Humans
D000906:Antibodies; D000914:Antibodies, Viral
ANTIBODY FORMATION; ECHO VIRUSES