Pregnant women who later got preeclampsia had less of a specific bacteria called Veillonella parvula in their mouths compared to women who stayed healthy during pregnancy.

The types and amounts of bacteria in the mouths of pregnant women who later got preeclampsia were more varied between individuals compared to women who stayed healthy.

In pregnant women, having more Veillonella bacteria in the mouth was linked to lower blood pressure readings.

Pregnant women who later got preeclampsia had more of several specific bacteria types (Methanosaeta, Desulfomicrobium, Enterococcus, Mycobacterium, Thiobacillus, and Ochrobactrum) in their mouths compared to women who stayed healthy.

In pregnant women, higher levels of Veillonella bacteria in the mouth were linked to higher levels of Prevotella bacteria.