“…Seroprevalence studies have shown that approximately 30-40% of women are not immune, therefore do not possess B19 antibodies, and are consequently at risk of B19 infection. A vertical transmission rate of 33% has been reported by the United Kingdom Public Health Laboratory Service (PHLS, 1990) and similar rates have been reported in other studies (Brown et al, 1984;Hall et al, 1990), although a recent report has disclosed a transmission rate of 51% (Yaegashi, 2000). On the basis of 4 million births occurring in Europe per annum (Eurostat, 1998), an average B19 seronegativity of 30% among pregnant women and a seroconversion rate for women of child-bearing age of 0.1-1%, it can be estimated, that up to 14,000 women will seroconvert during pregnancy.…”