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Incidence of clinical infections in a defined population of pregnant women.

The incidence of clinical maternal infections was determined in a prospective study of 44,016 pregnant women at 12 university hospitals. Viral and bacterial infections were the most frequently reported. Overall, the highest incidence of infections was for vaginitis, influenza/"flu"-like disease, and infections of the kidney, ureter, bladder; parasitic and fungal infections occurred at low rates. Most women experienced only one infection during pregnancy (89.7%); however, some had two different infections (8.5%), and a few had three or more (1.7%). The analysis of the effects of some of the maternal infections on the pregnant women and their children have been published, and further studies are in progress.