rubella in umbria (italy): serological assessment of immunity in adult women and congenital rubella detection after 1978. | antibody to rubella virus was measured in 3655 serum samples collected during 1973-1979 from females of child bearing age in umbria (italy). the overall incidence of seronegatives was 24 percent (hemagglutination inhibition (hai) antibody less than 1:16), with a higher proportion of seronegatives in the first years studied (1973-1976). a history of rubella infection was shown to be an unreliable index of immunity. one case of rubella congenital syndrome was detected following laboratory screenin ... | 1981 | 7326102 |