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Story highlights

Eight out of 10 pregnant women who have untreated syphilis will pass it on to the fetus in utero

Stillbirth, death of a newborn or infection are all possible outcomes for congenital syphilis

CNN  — 

Congenital syphilis cases – when a mother passes syphilis onto her baby during pregnancy or delivery – have more than doubled in the United States since 2013, according to an report released Tuesday by the US Centers for Disease Control and Prevention.

Eight out of 10 pregnant women who have untreated syphilis will pass it onto their babies through the placenta and this can lead to stillbirth or death of a newborn in up to 40% of affected pregnancies, according to the CDC.

The number of recorded cases swelled from 362 in 2013 to 918 in 2017, the report indicates. Five states – Arizona, California, Florida, Louisiana and Texas – account for 70% of the cases, according to the CDC. Additional cases were reported in 32 states, primarily Western and Southern states. The overall increase in congenital syphilis outpaces the national increase in sexually transmitted disease overall, the report indicated.