Viral superinfection.
D000818:Animals; D006509:Hepatitis B / Q000150:complications* / Q000382:microbiology; D006515:Hepatitis B virus / Q000502:physiology; D003699:Hepatitis D / Q000150:complications* / Q000382:microbiology; D003698:Hepatitis Delta Virus / Q000502:physiology; D006801:Humans; D014779:Virus Replication