NOTE: A surveillance case definition is a set of uniform criteria used to define a disease for public health surveillance. Surveillance case definitions enable public health officials to classify and count cases consistently across reporting jurisdictions. Surveillance case definitions are not intended to be used by healthcare providers for making a clinical diagnosis or determining how to meet an individual patient’s health needs.
CSTE Position Statement(s)
Screening recommendations and interpretation of perinatal hepatitis C virus (HCV) laboratory test results for infants born to HCV-infected mothers differ from those for adolescents and adults (1, 2). There has been a reported increase of HCV infection among women of childbearing age in numerous jurisdictions in the United States (3-5), and there would be an expected rise in perinatal transmission as a result. While there are no measures currently recommended for prevention of HCV transmission by pregnant women to their infants, HCV in pediatric populations can lead to significant illness (6) and it is important for those children to be appropriately assessed and in clinical care for HCV infection. Available curative HCV therapies are not currently recommended for pediatric patients under the age of 12, but that may change as data become available on the use of recently approved medications in younger pediatric populations.
There is no one standard HCV screening recommendation for infants born to HCV infected mothers. Available guidelines consistently recommend against antibody testing for children under 18 months of age due to transient maternal HCV antibody that may not reflect actual infection status of the child. However, there are multiple recommended timelines for HCV ribonucleic acid (RNA) screening of infants born to HCV-infected mothers. These include not testing until at least 1-2 months of age and, in some cases, recommending repeat serial testing of infants if an infant tests positive on one test, if done before 12 months of age. There is concern that testing outside of recommended parameters may identify transient HCV RNA in infants that may spontaneously clear the infection following perinatal exposure. Inappropriate testing and loss of follow-up of infants born to HCV-infected mothers has been reported (7).
There is currently no recommendation for universal HCV screening among pregnant women. Testing is only recommended for women of childbearing age if they are known to be at-risk for HCV infection, regardless of pregnancy status.
Perinatal hepatitis C in pediatric patients may range from asymptomatic to fulminant hepatitis.
Laboratory Criteria for Diagnosis
- HCV RNA positive test results for infants between 2 to 36 months of age; OR
- HCV genotype test results for infants between 2 to 36 months of age or greater; OR
- HCV antigen test results for infants between 2 to 36 months of age or greater.
Maternal infection with HCV of any duration, if known. Not known to have been exposed to HCV via a mechanism other than perinatal (e.g. not acquired via healthcare).
Criteria to Distinguish a New Case from an Existing Case
Test results prior to 2 months of age should not be used for classification. Test results after 36 months of age should be reported under the 2015 Acute and Chronic HCV Infection case classification and not as perinatal HCV infection. Cases in the specified age range that are known to have been exposed to HCV via healthcare and not perinatally should be reported under the 2015 position statement. Event date should be based on earliest relevant laboratory test date within the 2-36 month window.
Infant who has a positive test for HCV RNA nucleic acid amplification test (NAAT), HCV antigen, or detectable HCV genotype at ≥2 months and ≤36 months of age and is not known to have been exposed to HCV via a mechanism other than perinatal.
- CDC. Recommendations for the prevention and control of hepatitis C virus (HCV) infection and HCV-related chronic disease. MMWR 1998;47(RR-19). http://www.cdc.gov/mmwr/PDF/RR/RR4719.pdf.
- Smith B, et al. Recommendations for the identification of chronic hepatitis C virus infection among persons born during 1945-1965. MMWR 2012;61(RR-04). http://www.cdc.gov/mmwr/preview/mmwrhtml/rr6104a1.htm.
- Onofrey, et al. Hepatitis C virus infection among adolescents and young adults, Massachusetts 2002-2009. MMWR 2011;60(17):537-41. http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6017a2.htm.
- Zibbell J, et al. Increases in hepatitis C virus infection related to injection drug use among persons aged =30 years – Kentucky, Tennessee, Virginia, and West Virginia, 2006-2012. MMWR 2015;64(17):453-8. http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6417a2.htm
- Koneru A, Nelson N, Hariri S, et al. Increased hepatitis C virus (HCV) detection in women of childbearing age and potential risk for vertical transmission – United States and Kentucky, 2011-2014. MMWR Morb Mortal Wkly Rep 2016;65:705-10. DOI: http://dx.doi.org/10.15585/mmwr.mm6528a2.
- Mohan P, Colvin C, et al. Clinical spectrum and histopathologic features of chronic hepatitis C infection in children. J Pediatr 2007; 150(2): 168-174.
- Kuncio D, et al. Failure to test and identify perinatally infected children born to hepatitis C positive women. CID 2016. https://cid.oxfordjournals.org/content/early/2016/01/20/cid.ciw026.full.pdf+html.