"nBackground: Parvovirus B19 (B19) is the only member of the family Parvoviridae associated with human infection. Al­though there are some studies to estimate the immunity to parvovirus in various populations but there is no seroepidemiologi­cal sur­vey from Iran until now thus the age-specific immunity to human parvovirus infection was esti­mated.... https://www.isbasvurusuyap.com/product-category/biscuits-snacks/