主题词：Hepatitis B Virus Studies; Hepatitis C virus research; Viral gastroenteritis research and epidemiology; SARS-CoV-2 and COVID-19 Research; COVID-19 Clinical Research Studies; Respiratory viral infections research; Viral Infections and Immunology Research; Liver Disease Diagnosis and Treatment; Cytomegalovirus and herpesvirus research; Herpesvirus Infections and Treatments; Hepatitis Viruses Studies and Epidemiology; Animal Virus Infections Studies; HIV Research and Treatment; Viral Infections and Vectors; Parvovirus B19 Infection Studies; Cervical Cancer and HPV Research; Viral-associated cancers and disorders; HIV/AIDS drug development and treatment; Mosquito-borne diseases and control; Virus-based gene therapy research; Long-Term Effects of COVID-19; Influenza Virus Research Studies; SARS-CoV-2 detection and testing; HIV/AIDS Research and Interventions; Virology and Viral Diseases