Prion, Viral, Bacterial and Fungal Pathogens of Humans [VV210]; Human Immunology and Allergology [VV055]; acute course; severe course; human diseases; hepatitis A; viral hepatitis; liver; liver diseases; hepatitis B; hepatitis C; hepatitis D; hepatitis E; inflammation; children; alanine aminotransferase; aminotransferases; aetiology; intestines; man; Hepatovirus A; Hepatitis B virus; Hepatitis C virus; Hepatitis delta virus; Hepatitis E virus; Adenoviridae; Homo; Hominidae; primates; mammals; vertebrates; Chordata; animals; eukaryotes; Hepatovirus; Picornaviridae; Picornavirales; positive-sense ssRNA Viruses; ssRNA Viruses; RNA Viruses; viruses; Orthohepadnavirus; Hepadnaviridae; DNA Reverse Transcribing Viruses; Hepacivirus; Flaviviridae; Deltavirus; negative-sense ssRNA Viruses; Hepevirus; Hepeviridae; dsDNA Viruses; DNA Viruses; glutamate pyruvate transaminase; glutamic pyruvic transaminase; GPT; transaminases; causal agents; etiology