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Recent population expansions of hepatitis B virus in the United States.

ABSTRACT: The recent epidemic history of hepatitis B virus (HBV) infections in the United States is complex, as indicated by current disparity in HBV genotype distribution between acute and chronic hepatitis B cases and the rapid decline in hepatitis B incidence since the 1990s. We report temporal changes in the genetic composition of the HBV population using whole-genome sequences (n = 179) from acute hepatitis B cases (n = 1,206) identified through the Sentinel County Surveillance for Acute Hepatitis (1998 to 2006). HBV belonged mainly to subtypes A2 (75%) and D3 (18%), with times of their most recent common ancestors being 1979 and 1987, respectively. A2 underwent rapid population expansions in ca. 1995 and ca. 2002, coinciding with transient rises in acute hepatitis B notification rates among adults; D3 underwent expansion in ca. 1998. A2 strains from cases identified after 2002, compared to those before 2002, tended to cluster phylogenetically, indicating selective expansion of specific strains, and were significantly reduced in genetic diversity (P = 0.001) and frequency of drug resistance mutations (P = 0.001). The expansion of genetically close HBV A2 strains was associated with risk of infection among male homosexuals (P = 0.03). Incident HBV strains circulating in the United States were recent in origin and restricted in genetic diversity. Disparate transmission dynamics among phylogenetic lineages affected the genetic composition of HBV populations and their capacity to maintain drug resistance mutations. The tendency of selectively expanding HBV strains to be transmitted among male homosexuals highlights the need to improve hepatitis B vaccination coverage among at-risk adults.Hepatitis B virus (HBV) remains an important cause of acute and chronic liver disease globally and in the United States. Genetic analysis of HBV whole genomes from cases of acute hepatitis B identified from 1998 to 2006 in the United States showed dominance of genotype A2 (75%), followed by D3 (18%). Strains of both subtypes were recent in origin and underwent rapid population expansions from 1995 to 2000, indicating increase in transmission rate for certain HBV strains during a period of decline in the reported incidence of acute hepatitis B in the United States. HBV A2 strains from a particular cluster that experienced the most recent population expansion were more commonly detected among men who have sex with men. Vaccination needs to be stepped up to protect persons who remain at risk of HBV infection.

SUBMITTER: Ramachandran S

PROVIDER: S-EPMC4249146 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature

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Recent population expansions of hepatitis B virus in the United States.

Ramachandran Sumathi S Purdy Michael A MA Xia Guo-liang GL Campo David S DS Dimitrova Zoya E ZE Teshale Eyasu H EH Teo Chong Gee CG Khudyakov Yury E YE

Journal of virology 20140903 24

<h4>Unlabelled</h4>The recent epidemic history of hepatitis B virus (HBV) infections in the United States is complex, as indicated by current disparity in HBV genotype distribution between acute and chronic hepatitis B cases and the rapid decline in hepatitis B incidence since the 1990s. We report temporal changes in the genetic composition of the HBV population using whole-genome sequences (n = 179) from acute hepatitis B cases (n = 1,206) identified through the Sentinel County Surveillance for ...[more]

PMID: 25187549

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Project description:The effect of hepatitis B virus (HBV) coinfection in patients with hepatitis C virus (HCV) remains unclear. We used the National Veterans Affairs HCV Clinical Case Registry to identify patients with confirmed HCV viremia during 1997-2005. We defined HBV coinfection as a positive test for hepatitis B surface antigen, HBV DNA, or hepatitis B e antigen. We defined cirrhosis and hepatocellular carcinoma (HCC) based on the validated ICD-9 codes and determined mortality through the end of 2009. We performed Cox proportional hazard regression analyses to examine the effect of HBV coinfection stratified by HBV DNA status (positive or negative) on the risk of cirrhosis, HCC, and death adjusting for patients' age, gender, race, human immunodeficiency virus (HIV) infection, alcohol or drug use, Deyo Score, and antiviral treatment. Among 99,548 patients with HCV infection, 1,370 patients (1.4%) had HBV coinfection. Of the coinfected patients, 677 (49.4%) patients had at least one HBV DNA test done and 303 patients (44.7%) tested positive for HBV DNA. The incidence rates of cirrhosis, HCC, and death were significantly higher in patients with HBV coinfection and detectable HBV DNA compared to HCV monoinfection (36.8, 6.9, and 41.7 versus 17.4, 3.6, and 31.4 per 1,000 person-years, respectively; P < 0.05 for all comparisons). After adjustment for demographic, clinical, and treatment factors, patients with detectable HBV DNA had a significantly higher risk for cirrhosis (hazard ratio [HR]?= 1.89 95% confidence interval [CI]?= 1.46-2.45), HCC (HR = 2.12, 95% CI = 1.26-3.60), and death (HR = 1.62, 95% CI = 1.33-1.99) compared to HCV monoinfected patients. There were no differences in the risk of cirrhosis, HCC, or overall mortality between coinfected patients with undetectable HBV DNA and those with HCV monoinfection (HR = 1.18, 95% CI = 0.90-1.55; 1.54, 95% CI = 0.93-2.56; 1.08, 95% CI = 0.88-1.33, respectively).We found that while only a small number of HCV patients were coinfected with HBV, patients with documented HBV viremia were at a significantly higher risk for cirrhosis, HCC, and overall death than HCV monoinfected patients. Absence of HBV replication was associated with a clinical course similar to that of HCV monoinfected patients.

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Recent population expansions of hepatitis B virus in the United States.

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Recent population expansions of hepatitis B virus in the United States.

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