Cytomegalovirus Seroprevalence in Northern Poland in the Population Planning Pregnancy and Pregnant Women.

Cytomegalovirus is an enveloped DNA virus. All forms of CMV infection-primary infection, reactivation, and infection with a different strain-may be asymptomatic. The risk of vertical transmission in the periconceptional period is approximately 20%, the risk of primary infection in the first trimester is approximately 30%, and in the third trimester the risk increases to 70%. However, the most severe forms of congenital cytomegaly in newborns are related to infections in the periconceptional period. Offering a vaccine to the seronegative patients planning pregnancy may decrease incidents of congenital cytomegaly in neonates. The authors performed retrospective analysis of seroprevalence of CMV in 909 women who reported for pre-conceptional visits or routine pregnancy follow-ups (2003-2023). In the analyzed group, 577 (63.7%) women were seropositive. No influence related to the women's age and place of residence was found. Higher seroprevalence was observed in women with children or those working in contact with many people. In the group of 332 seronegative patients, 21 (0.6%) were diagnosed with primary infection during pregnancy. Vaccinating 36.3% of patients planning pregnancy could significantly decrease the risk of primary infection during pregnancy, vertical transmission of CMV, and symptomatic infection in the neonates.