The preprint system of biomedical science and technology papers involves 20 first-level subject classifications including covid-19 and more than 160 second-level subject classifications.

COVID-19(3)
Virology(3)    Epidemiology    Diagnosis and Therapeutics   

Overview of Medicine and Health Care(144)
General Theory of Medicine and Hygiene(3)    Current Situation and Overview of Medicine(1)    Medical Research Methods(131)    Medical Education(8)    Medical Literature Retrieval(1)   

Preventive Medicine and Hygienics(22)
Basic Health Science(1)    Environmental Health and Environmental Medicine    Labor Hygiene    Radiologic Health    Combat Readiness Health    Nutrition and Food Hygiene    Personal Hygiene    Family Planning and Health    Maternal and Child Health    Child and Adolescent Health    Epidemic Diseases and Epidemic Prevention    Health Care Management(21)   

Medicine, Chinese Traditional(2)
Research on Modernization of Traditional Chinese Medicine(1)    The Relationship Between TCM and Other Disciplines    Theories of Different Schools of Tradition Chinese Medicine    History of Traditional Chinese Medicine    Traditional Chinese Medicine Prevention and Hygiene    Current Situation and General Situation of Chinese Medicine    Basic Theories of Chinese Medicine    Clinical Studies of Traditional Chinese Medicine    Internal Medicine of Traditional Chinese Medicine(1)    Surgery of Chinese Medicine    Obstetrics and Gynecology of Traditional Chinese Medicine    Pediatrics of Chinese Medicine    Oncology of Traditional Chinese Medicine    Osteology and Traumatology of Traditional Chinese Medicine    Chinese Dermatology    Ophthalmology and Otolaryngoloy of Chinese Medicine    Other disciplines of Traditional Chinese Medicine    Chinese Medicine Emergency Medicine    Science of Chinese Pharmacology    Medicine of Chinese Minorities   

Preclinical Medicine(1)
Medical General Science(1)    Human Morphology    Human Physiology    Medical Biochemistry and Molecular Biology    Medical Biophysics    Pathology    Medical Microbiology    Medical Parasitology    Medical Immunology    Medical Genetics    Medical Psychology and Pathologic Psychology   

Clinical Medicine(8)
Diagnostics(1)    Therapeutics(5)    Nursing(2)    Hospice Science    Rehabilitation Medicine   

Internal Medicine(6)
Infectious Disease(1)    Tuberculosis    Parasitic Diseases    Cardiovascular Disease(3)    Hematologic and lymphatic Diseases    Respiratory and Chest Diseases    Digestive and Abdominal Diseases(1)    Endocrine Diseases and Metabolic Diseases    Systemic Disease(1)    Endemiology   

Surgery(4)
Surgical Pathology and Anatomy    Surgical Diagnostics    Surgical Therapeutics    Surgical Instruments and Instruments for Diagnosis and Treatment    Operative Surgery(1)    Plastic Surgery    Surgical infection(1)    Traumatic Surgery    Reparative Sursery(1)    Osteopathic Medicine(1)    Urogenital Disease   

Obstetrics and Gynecology(2)
Gynaecology(1)    Gynecological Operation    Obstetrics    Clinical Eugenetics(1)    Midwifery    Obstetric Surgical Procedures   

Pediatrics
Pediatric Emergency and Management    Neonatal and Premature Infant Disease    Nutritional Disorders in Infants    Paediatric Internal Medicine    Pediatric Surgery    Other Diseases in Children   

Oncology(6)
General Issues In Oncology(3)    The Relationship Between Oncology and Other Disciplines(1)    Cardiovascular Tumor    Hematopoietic and Lymphatic Tumors    Experimental Studies in Oncology    Respiratory Tumor(1)    Digestive System Tumor    Endocrine Gland Tumor    Urogenital Tumors    Motor Tumor    Nervous System Neoplasms    Dermatoma    Otorhinolaryngologic Neoplasms    Eye Neoplasms    Oral and Maxillofacial Tumors    Other Tumors(1)   

Neurology(1)
Neurology(1)    Psychiatry   

Dermatology and Venereal
Dermatology    Venereal   

Otolaryngology
Otolaryngological Surgery    Otolaryngological Mycosis    Ear Science and Ear Disease    Nasal Science and Nasal Diseases    Pharyngeal Science and Pharyngeal Diseases    Laryngology and Laryngeal Diseases    Tracheoscopy and Esophagoscopy   

Ophthalmology(1)
Ophthalmologic Diagnostics    A Common Disease of The Eye    Ocular Membrane Disease    Uveal Diseases(1)    Diseases of The Retina and Optic Nerve    Intraocular Pressure and Glaucoma    Lens and Vitreous Diseases    Diseases of Ocular Appendages    Ophthalmic Dioptrics    Eye Injuries and Foreign Bodies    Ophthalmosurgery    Pediatric Ophthalmology    Tropical Ophthalmology   

Stomatology
Prevention of Oral Diseases and Oral Hygiene    Pathology, Oral    Diagnosis, Oral    Oral Medicine    Surgery, Oral    Oral Orthopaedics    Oral Diseases of The Elderly    Oral Diseases of Children   

Foreign Ethnic Medicine
Asian Ethnic Medicine    African Ethnic Medicine    European National Medicine    Medicine of All Ethnicities in Oceania    American Ethnic Medicine   

Special Medicine
Radiology Medicine    Military Medicine    Naval Medicine    Submarine Medicine    Aerospace Medicine    Sports Medicine    Forensic Medicine   

Pharmacology(3)
Pharmaceutical Sciences    Basic Pharmaceutical Science    Current Situation and General Situation of Pharmacy    Chemistry, Pharmaceutical    Pharmaceutical Analysis    Codex    Natural Pharmacology    Pharmaceutical Research Methods    Biopharmaceutics    Pharmacologic Educaiton(1)    Pharmacy Administration    Pharmacology(2)    Drug    Drug Use In All The Subjects    Toxicology   

Others(1049)
Others(1049)