Hepatitis C Exposure Diagnosis and Testing in Infants Born to Hepatitis C Virus-infected Mothers.

Background: There has been a 5-fold increase in the number of cases of hepatitis C virus (HCV) infection among pregnant women, which is potentially associated with the increase in opioid use.

Methods: This study was a retrospective review of infants born at a tertiary urban hospital in New Jersey, from January 1, 2011 to January 1, 2021, who were born to mothers with a prenatal diagnosis of HCV.

Results: Of the 142 mothers with a prenatal diagnosis of HCV, 114 (80%) infants had a diagnosis of HCV exposure in the electronic health records. Of the HCV-exposed infants with follow-up data at 24 months of age, 52 (46%) were tested, with 34 of 52 (65%) receiving adequate testing. Infants documented as HCV exposed were more likely to be born to a mother with nonopioid drug use in pregnancy ( P = 0.01) and have a higher birth weight ( P = 0.03). Of tested infants, those with a higher number of well-child pediatrician visits ( P = 0.01) were more likely to receive adequate testing. Trends showed more polymerase chain reaction testing than antibody testing for those who were inadequately tested.

Conclusions: A significant proportion of infants born to HCV-infected mothers were either not identified at birth (20%) or did not receive adequate testing on follow-up (35%). Further work needs to be done to improve documentation of HCV exposure at birth and follow-up testing to avoid missing congenitally acquired HCV.