CD34 and syphilis: Because all of these UCB units were screened according to inclusion and exclusion criteria established for banking, characterized in terms of cell content, HLA typing, microbiological tests, CD34+ and CD45+ cell number, and viability and serology tested for blood-transmitted infectious diseases, such as human immune-deficiency virus (VIH), hepatitis B virus (HBV), hepatitis C virus (HCV), toxoplasma, cytomegalovirus, and syphilis, both in cord blood and maternal serum, the cells that can be obtained from these units could be eligible for other clinical purposes.