Bats carry pathogenic hepadnaviruses antigenically related to hepatitis B virus and capable of infecting human hepatocytes

Hepatitis B virus (HBV) is the prototype hepadnavirus; 40% of humans have current or past infection. In a global investigation of viral diversity in bats, we discovered three unique hepadnavirus species. The relatedness of these viruses to HBV suggests that bats might constitute ancestral sources of primate hepadnaviruses. Infection patterns in bats resembled human infection with HBV. After resurrection from bat tissues, pseudotyped viruses carrying surface proteins of one bat hepadnavirus could infect human liver cells. HBV vaccination is probably not protective against these viruses, but viral replication could be blocked by a reverse transcriptase inhibitor used as an anti-HBV drug in humans. The potential of bat hepadnaviruses to infect humans should be considered in programs aimed at eradicating HBV.