3. Results
In total, 2,238 cases with maternal viral infections during pregnancy were identified in the HCCSCA between 1980 and 2009 (3.9% of the 57,231 liveborn infants). Of these new-borns, 1,153 cases were detected with infections during the 1st trimester. The detailed numbers of specific viral infections identified were as follows: influenza (2,016), enterovirus (48), herpes simplex (28), hepatitis B (22), varicella-zoster (14), respiratory syncytial virus (11) and unspecified virus infections (104). Live births in Hungary between 1980 and 2009 were 3,009,303, thus 57,231 pregnancies represented 1.9% of all Hungarian births.