The authors have dispensarized for more than ten years HBsAg carriers at the Second Medical Clinic of the Olomouc Faculty Hospital when antigenaemia was detected during blood donorship. Since 1990 the authors dispensarize also women where HBs antigenaemia was revealed during pregnancy. In the presented paper the authors analyze this group of women. In 1990-1991 the authors examined blood samples for HBsAg from 12,042 symptom-free pregnant women. HBsAg positivity was proved in 34 women (0.28%). Eleven women (32.3%) are regularly followed up since delivery. The authors know nothing about the fate of 10 women (29.4%), as they did not respond to repeated invitations to the surgery. It must be however mentioned that 6 of them are Vietnamese and probably left Czechoslovakia. Four women (11.7%) did not attend the clinic for examination but the authors know that they were delivered of their babies elsewhere. In the remainder, i.e. 8 women the delivery was normal, usually in term. The neonates were passively as well as actively immunized at the appropriate dates. Their umbilical blood (if collected) was HBsAg positive, while the venous blood was in all instances negative. All 20 women who attended examination were throughly examined (ultrasound, HBeAg, HBeAb etc.) and the clinical picture is that of a "healthy" HBsAg carrier (not verified by histological examination).