(CNN) A majority of pregnant women who are diagnosed with coronavirus don't experience more severe illness than the general population, according to a new study.

They also don't seem to pass the infection on to their babies.

A study of 43 pregnant women diagnosed with the virus in New York was published Monday in the American Journal of Obstetrics & Gynecology.

The study took place over a two week period from March 13 to 27.

About 80% of study participants, 37 women, experienced a mild form of the disease while four, about 15%, developed more severe forms, the study said. Two of those women, accounting for 5% of the study, experienced "critical disease," according to the study.