| 119 | Humans |
| 89 | Animals |
| 48 | Female |
| 40 | Male |
| 37 | Coronavirus Infections (epidemiology) |
| 24 | Coronavirus Infections (transmission) |
| 24 | Coronavirus Infections (diagnosis) |
| 23 | Adult |
| 22 | Coronavirus Infections (virology) |
| 19 | Middle Aged |
| 16 | Pneumonia, Viral (epidemiology) |
| 16 | Mice |
| 16 | Aged |
| 15 | Cattle |
| 14 | Coronavirus Infections (veterinary) |
| 14 | Child |
| 14 | Child, Preschool |
| 13 | Coronavirus Infections (prevention & control) |
| 12 | Rats |
| 12 | Infant |
| 12 | Disease Outbreaks |
| 12 | Adolescent |
| 11 | Young Adult |
| 11 | Pneumonia, Viral (diagnosis) |
| 11 | China |
| 11 | Antiviral Agents (pharmacology) |
| 10 | Time Factors |
| 10 | Pneumonia, Viral (transmission) |
| 10 | China (epidemiology) |
| 10 | Antibodies, Viral (blood) |
| 9 | Severe Acute Respiratory Syndrome (virology) |
| 9 | Respiratory Tract Infections (epidemiology) |
| 9 | Molecular Sequence Data |
| 9 | Middle East Respiratory Syndrome Coronavirus |
| 9 | Infant, Newborn |
| 9 | Antibodies, Viral (analysis) |
| 9 | Amino Acid Sequence |
| 8 | Severe Acute Respiratory Syndrome (epidemiology) |
| 8 | Severe Acute Respiratory Syndrome (diagnosis) |
| 8 | SARS Virus (genetics) |
| 8 | Respiratory Tract Infections (virology) |
| 8 | Coronavirus (isolation & purification) |
| 8 | Betacoronavirus |
| 7 | Virus Diseases (virology) |
| 7 | Swine |
| 7 | Structure-Activity Relationship |
| 7 | Retrospective Studies |
| 7 | Respiratory Tract Infections (veterinary) |
| 7 | Radiography, Thoracic |
| 7 | Pneumonia, Viral (prevention & control) |
| 7 | Phylogeny |
| 7 | Global Health |
| 7 | Genome, Viral |
| 7 | Coronavirus Infections |
| 7 | Cell Line |
| 7 | Cattle Diseases (epidemiology) |
| 7 | Antigens, Viral (analysis) |
| 6 | Virus Diseases (epidemiology) |
| 6 | Viral Proteins (genetics) |
| 6 | Spike Glycoprotein, Coronavirus |
| 6 | Species Specificity |
| 6 | SARS Virus (immunology) |
| 6 | Respiratory Syncytial Virus Infections (epidemiology) |
| 6 | Protein Binding |
| 6 | Polymerase Chain Reaction |
| 6 | Pneumonia, Viral (therapy) |
| 6 | Lung (virology) |
| 6 | Coronavirus Infections (therapy) |
| 6 | Coronavirus Infections (pathology) |
| 6 | Cattle Diseases (virology) |
| 6 | Cats |
| 6 | Antiviral Agents (chemistry) |
| 6 | Antiviral Agents (chemical synthesis) |
| 6 | Aged, 80 and over |
| 5 | World Health Organization |
| 5 | Virus Replication |
| 5 | Viral Proteins (immunology) |
| 5 | Viral Proteins (chemistry) |
| 5 | Viral Envelope Proteins (chemistry) |
| 5 | Tomography, X-Ray Computed |
| 5 | Sequence Alignment |
| 5 | Sensitivity and Specificity |
| 5 | Saudi Arabia |
| 5 | Saudi Arabia (epidemiology) |
| 5 | SARS Virus (isolation & purification) |
| 5 | Prognosis |
| 5 | Prevalence |
| 5 | Pneumonia, Viral |
| 5 | Middle East Respiratory Syndrome Coronavirus (isolation & purification) |
| 5 | Fluorescent Antibody Technique |
| 5 | Dogs |
| 5 | Disease Outbreaks (prevention & control) |
| 5 | Cross-Sectional Studies |
| 5 | Coronavirus Infections (immunology) |
| 5 | Coronavirus Infections (complications) |
| 5 | Coronavirus (genetics) |
| 5 | Coronaviridae (isolation & purification) |
| 5 | Coronaviridae (immunology) |
| 5 | Cattle Diseases (diagnosis) |
| 5 | Betacoronavirus (pathogenicity) |
| 5 | Age Factors |
| 4 | Viruses (isolation & purification) |
| 4 | Virus Replication (drug effects) |
| 4 | Virus Diseases (veterinary) |
| 4 | Virus Cultivation |
| 4 | T-Lymphocytes, Cytotoxic (immunology) |
| 4 | Severe Acute Respiratory Syndrome (transmission) |
| 4 | Severe Acute Respiratory Syndrome (prevention & control) |
| 4 | Seroepidemiologic Studies |
| 4 | SARS Virus (physiology) |
| 4 | SARS Virus (pathogenicity) |
| 4 | SARS Virus (chemistry) |
| 4 | Risk Factors |
| 4 | Respiratory Tract Infections (microbiology) |
| 4 | RNA, Viral (genetics) |
| 4 | Protein Structure, Secondary |
| 4 | Population Surveillance |
| 4 | Pneumonia, Viral (virology) |
| 4 | Pneumonia (virology) |
| 4 | Peptides (chemistry) |
| 4 | Pandemics (prevention & control) |
| 4 | Neutralization Tests |
| 4 | Murine hepatitis virus (immunology) |
| 4 | Models, Molecular |
| 4 | Microscopy, Electron |
| 4 | Mice, Inbred C57BL |
| 4 | Mice, Inbred BALB C |
| 4 | Magnetic Resonance Spectroscopy |
| 4 | Host-Pathogen Interactions |
| 4 | Feces (microbiology) |
| 4 | Enzyme-Linked Immunosorbent Assay |
| 4 | Coronavirus |
| 4 | Coronavirus Infections (drug therapy) |
| 4 | Coronavirus (classification) |
| 4 | Coronaviridae Infections (veterinary) |
| 4 | Coronaviridae Infections (pathology) |
| 4 | Coronaviridae Infections (diagnosis) |
| 4 | Contact Tracing |
| 4 | Cluster Analysis |
| 4 | Circular Dichroism |
| 4 | Chickens |
| 4 | Cattle Diseases (microbiology) |
| 4 | Camelus (virology) |
| 4 | Base Sequence |
| 4 | Algorithms |
| 4 | Acute Disease |
| 3 | Zoonoses |
| 3 | Viruses (genetics) |
| 3 | Viruses (classification) |
| 3 | Virus Diseases (diagnosis) |
| 3 | Viral Vaccines (immunology) |
| 3 | Viral Proteins (metabolism) |
| 3 | Viral Fusion Proteins |
| 3 | Viral Envelope Proteins (genetics) |
| 3 | Vero Cells |
| 3 | United States (epidemiology) |
| 3 | Travel |
| 3 | Swine Diseases (virology) |
| 3 | Sweden (epidemiology) |
| 3 | Surveys and Questionnaires |
| 3 | Severe Acute Respiratory Syndrome (therapy) |
| 3 | Severe Acute Respiratory Syndrome (pathology) |
| 3 | Sequence Homology, Amino Acid |
| 3 | SARS Virus (metabolism) |
| 3 | SARS Virus (drug effects) |
| 3 | Reverse Transcriptase Polymerase Chain Reaction |
| 3 | Respiratory Syncytial Virus Infections (virology) |
| 3 | Respiratory Syncytial Virus Infections (veterinary) |
| 3 | Republic of Korea (epidemiology) |
| 3 | Reproducibility of Results |
| 3 | Rabbits |
| 3 | RNA, Viral (analysis) |
| 3 | Protein Structure, Tertiary |
| 3 | Protein Folding |
| 3 | Pregnancy |
| 3 | Practice Guidelines as Topic |
| 3 | Poultry Diseases (virology) |
| 3 | Pneumonia, Viral (diagnostic imaging) |
| 3 | Pneumonia, Viral (complications) |
| 3 | Pneumonia (diagnosis) |
| 3 | Paramyxoviridae Infections (epidemiology) |
| 3 | Pandemics |
| 3 | Open Reading Frames |
| 3 | Molecular Dynamics Simulation |
| 3 | Models, Statistical |
| 3 | Models, Biological |
| 3 | Membrane Glycoproteins (immunology) |
| 3 | Lung (pathology) |
| 3 | Influenza, Human (epidemiology) |
| 3 | Incidence |
| 3 | Fever (virology) |
| 3 | Fatal Outcome |
| 3 | Drug Design |
| 3 | Diarrhea (veterinary) |
| 3 | Diagnosis, Differential |
| 3 | DNA, Viral (analysis) |
| 3 | Cytopathogenic Effect, Viral |
| 3 | Cough (virology) |
| 3 | Coronavirus, Bovine (immunology) |
| 3 | Coronavirus Infections (psychology) |
| 3 | Coronavirus Infections (physiopathology) |
| 3 | Coronavirus Infections (diagnostic imaging) |
| 3 | Coronavirus (immunology) |
| 3 | Coronaviridae Infections (immunology) |
| 3 | Computational Biology (methods) |
| 3 | Chlorocebus aethiops |
| 3 | Cattle Diseases (etiology) |
| 3 | Bronchoalveolar Lavage Fluid (virology) |
| 3 | Bronchoalveolar Lavage Fluid (microbiology) |
| 3 | Biomarkers (blood) |
| 3 | Binding Sites |
| 3 | Betacoronavirus (isolation & purification) |
| 3 | Betacoronavirus (genetics) |
| 3 | Bacterial Infections (veterinary) |
| 3 | Antiviral Agents (therapeutic use) |
| 3 | Antibodies, Bacterial (analysis) |
| 3 | Animal Husbandry |
| 2 | Zoonoses (virology) |
| 2 | Zoonoses (epidemiology) |
| 2 | Virus Physiological Phenomena |
| 2 | Virulence |
| 2 | Viral Structural Proteins (genetics) |
| 2 | Viral Proteins (physiology) |
| 2 | Viral Proteins (analysis) |
| 2 | Viral Load |
| 2 | Viral Envelope Proteins (metabolism) |
| 2 | Viral Envelope Proteins (immunology) |
| 2 | Vaccines, DNA (genetics) |
| 2 | Travel-Related Illness |
| 2 | Transmissible gastroenteritis virus (isolation & purification) |
| 2 | Transmissible gastroenteritis virus (genetics) |
| 2 | Tonsillectomy |
| 2 | Toll-Like Receptor 7 (immunology) |
| 2 | Tertiary Care Centers |
| 2 | Syndrome |
| 2 | Swine Diseases (microbiology) |
| 2 | Sweden |
| 2 | Survival Rate |
| 2 | Substrate Specificity |
| 2 | Spectrometry, Fluorescence |
| 2 | Specimen Handling |
| 2 | Software |
| 2 | Signal Transduction |
| 2 | Severe Acute Respiratory Syndrome (physiopathology) |
| 2 | Severe Acute Respiratory Syndrome (metabolism) |
| 2 | Severe Acute Respiratory Syndrome (diagnostic imaging) |
| 2 | Serologic Tests (methods) |
| 2 | Sequence Homology, Nucleic Acid |
| 2 | Sequence Analysis, DNA |
| 2 | SARS Virus |
| 2 | SARS Virus (growth & development) |
| 2 | Rotavirus Infections (veterinary) |
| 2 | Rotavirus Infections (diagnosis) |
| 2 | Risk |
| 2 | Rhinovirus (pathogenicity) |
| 2 | Reverse Transcriptase Polymerase Chain Reaction (methods) |
| 2 | Respiratory Tract Infections (physiopathology) |
| 2 | Respiratory Tract Infections (etiology) |
| 2 | Respiratory Tract Diseases (virology) |
| 2 | Respiratory Tract Diseases (veterinary) |
| 2 | Respiratory Tract Diseases (immunology) |
| 2 | Respiratory System (virology) |
| 2 | Respiratory Syncytial Virus Infections (transmission) |
| 2 | Respiratory Syncytial Virus Infections (physiopathology) |
| 2 | Recombination, Genetic |
| 2 | Recombinant Proteins |
| 2 | Real-Time Polymerase Chain Reaction |
| 2 | Random Allocation |
| 2 | RNA Viruses (isolation & purification) |
| 2 | RNA Interference |
| 2 | Public Health Surveillance |
| 2 | Protein Multimerization |
| 2 | Protein Conformation |
| 2 | Poultry Diseases (immunology) |
| 2 | Polymerase Chain Reaction (methods) |
| 2 | Politics |
| 2 | Pneumonia, Viral (pathology) |
| 2 | Pneumonia, Viral (mortality) |
| 2 | Pneumonia, Viral (drug therapy) |
| 2 | Picornaviridae Infections (epidemiology) |
| 2 | Peptidyl-Dipeptidase A (metabolism) |
| 2 | Peptides (immunology) |
| 2 | Peptides (chemical synthesis) |
| 2 | Peptide Fragments (pharmacology) |
| 2 | Peptide Fragments (chemistry) |
| 2 | Patient Isolation |
| 2 | Patient Care Planning |
| 2 | Paramyxoviridae Infections (virology) |
| 2 | Paramyxoviridae Infections (physiopathology) |
| 2 | Palatine Tonsil (pathology) |
| 2 | Nictitating Membrane (microbiology) |
| 2 | Neural Networks, Computer |
| 2 | Mycoplasma Infections (veterinary) |
| 2 | Mycoplasma (isolation & purification) |
| 2 | Murine hepatitis virus |
| 2 | Molecular Structure |
| 2 | Molecular Epidemiology |
| 2 | Middle East Respiratory Syndrome Coronavirus (genetics) |
| 2 | Middle East (epidemiology) |
| 2 | Microbial Sensitivity Tests |
| 2 | Mice, SCID |
| 2 | Mice, Knockout |
| 2 | Membrane Proteins (genetics) |
| 2 | Membrane Proteins (chemistry) |
| 2 | Membrane Glycoproteins (metabolism) |
| 2 | Membrane Glycoproteins (genetics) |
| 2 | Membrane Glycoproteins (chemistry) |
| 2 | Mass Spectrometry |
| 2 | Magnetic Resonance Imaging |
| 2 | Macrophages (virology) |
| 2 | Macrophages (immunology) |
| 2 | Lung Diseases (immunology) |
| 2 | Lung (microbiology) |
| 2 | Lung (metabolism) |
| 2 | Lung (immunology) |
| 2 | Lung (diagnostic imaging) |
| 2 | Liver (pathology) |
| 2 | Lipid Bilayers (metabolism) |
| 2 | Kinetics |
| 2 | Intestines (pathology) |
| 2 | International Health Regulations |
| 2 | Information Dissemination |
| 2 | Infectious bronchitis virus (physiology) |
| 2 | Infectious bronchitis virus (isolation & purification) |
| 2 | Infant, Newborn, Diseases (etiology) |
| 2 | India |
| 2 | Immunoglobulin G (blood) |
| 2 | Immunocompetence |
| 2 | Immunization |
| 2 | Immunity |
| 2 | Immunity, Innate |
| 2 | Hypertrophy |
| 2 | Hydrophobic and Hydrophilic Interactions |
| 2 | Hospitalization |
| 2 | Hepacivirus (drug effects) |
| 2 | Hematopoietic Stem Cell Transplantation (adverse effects) |
| 2 | Hemagglutinins, Viral (physiology) |
| 2 | Hemagglutinins, Viral (immunology) |
| 2 | Hemagglutinins, Viral (analysis) |
| 2 | Hemagglutination Inhibition Tests |
| 2 | Hemagglutination Inhibition Tests (veterinary) |
| 2 | Health Planning |
| 2 | Guinea Pigs |
| 2 | Genetic Vectors |
| 2 | Genes, Viral |
| 2 | Gene Expression Regulation |
| 2 | France |
| 2 | Follow-Up Studies |
| 2 | Fluorescent Dyes |
| 2 | Fever (epidemiology) |
| 2 | Escherichia coli Infections (veterinary) |
| 2 | Epitopes, T-Lymphocyte |
| 2 | Epithelial Cells (virology) |
| 2 | Enzyme-Linked Immunosorbent Assay (methods) |
| 2 | Enterocolitis, Pseudomembranous (microbiology) |
| 2 | Enterocolitis, Pseudomembranous (etiology) |
| 2 | Enteritis (veterinary) |
| 2 | Encephalomyelitis (pathology) |
| 2 | Drug Therapy, Combination |
| 2 | Disease Reservoirs (virology) |
| 2 | Disease Reservoirs (veterinary) |
| 2 | Disease Progression |
| 2 | Disease Models, Animal |
| 2 | Diarrhea (diagnosis) |
| 2 | Demyelinating Diseases (pathology) |
| 2 | Delivery of Health Care |
| 2 | Databases, Genetic |
| 2 | Cysteine Endopeptidases (chemistry) |
| 2 | Cough (epidemiology) |
| 2 | Coronavirus (physiology) |
| 2 | Coronaviridae Infections (physiopathology) |
| 2 | Coronaviridae (ultrastructure) |
| 2 | Conservation of Natural Resources |
| 2 | Consensus Sequence |
| 2 | Computational Biology |
| 2 | Comorbidity |
| 2 | Chymotrypsin (chemistry) |
| 2 | Chronic Disease |
| 2 | Chromatography, High Pressure Liquid |
| 2 | Chick Embryo |
| 2 | Cells, Cultured |
| 2 | Cattle Diseases (transmission) |
| 2 | Cattle Diseases (immunology) |
| 2 | Catalytic Domain |
| 2 | Catalysis |
| 2 | Case-Control Studies |
| 2 | Brain (pathology) |
| 2 | Body Weight |
| 2 | Biosensing Techniques |
| 2 | Betacoronavirus (physiology) |
| 2 | Bacterial Infections (diagnosis) |
| 2 | Bacteria (isolation & purification) |
| 2 | Bacteria (classification) |
| 2 | Australia (epidemiology) |
| 2 | Antibodies, Bacterial (blood) |
| 2 | Animals, Newborn |
| 2 | Animal Nutritional Physiological Phenomena |
| 2 | Animal Feed (analysis) |
| 1 | Zoonoses (transmission) |
| 1 | Zidovudine (therapeutic use) |
| 1 | Yellow fever virus (isolation & purification) |
| 1 | Yellow fever virus (genetics) |
| 1 | Workforce |
| 1 | Whole Genome Sequencing (methods) |
| 1 | West Nile virus |
| 1 | West Nile Fever (epidemiology) |
| 1 | Weight Gain |
| 1 | Water-Electrolyte Balance |
| 1 | Viruses (metabolism) |
| 1 | Viruses (drug effects) |
| 1 | Virus Internalization (drug effects) |
| 1 | Virus Diseases |
| 1 | Virus Diseases (transmission) |
| 1 | Virus Diseases (physiopathology) |
| 1 | Virus Diseases (pathology) |
| 1 | Virus Diseases (mortality) |
| 1 | Virus Diseases (microbiology) |
| 1 | Virus Diseases (metabolism) |
| 1 | Virus Diseases (genetics) |
| 1 | Virus Diseases (drug therapy) |
| 1 | Virus Diseases (complications) |
| 1 | Virology (methods) |
| 1 | Virion (chemistry) |
| 1 | Viral Vaccines (pharmacology) |
| 1 | Viral Vaccines (isolation & purification) |
| 1 | Viral Vaccines (genetics) |
| 1 | Viral Vaccines (administration & dosage) |
| 1 | Viral Structural Proteins (chemistry) |
| 1 | Viral Proteins (isolation & purification) |
| 1 | Viral Proteins (antagonists & inhibitors) |
| 1 | Viral Nonstructural Proteins (genetics) |
| 1 | Viral Matrix Proteins (physiology) |
| 1 | Viral Matrix Proteins (genetics) |
| 1 | Viral Envelope Proteins (pharmacology) |
| 1 | Viral Envelope Proteins (analysis) |
| 1 | Vaccines, Synthetic |
| 1 | Vaccines, Synthetic (chemistry) |
| 1 | Vaccines, DNA (pharmacology) |
| 1 | Vaccines, DNA (administration & dosage) |
| 1 | Vaccines (immunology) |
| 1 | Ureaplasma Infections (veterinary) |
| 1 | Ureaplasma Infections (epidemiology) |
| 1 | Ureaplasma Infections (complications) |
| 1 | Ureaplasma (isolation & purification) |
| 1 | Ureaplasma (immunology) |
| 1 | Universal Precautions |
| 1 | United States |
| 1 | United Kingdom |
| 1 | United Kingdom (epidemiology) |
| 1 | United Arab Emirates (epidemiology) |
| 1 | Unilamellar Liposomes (metabolism) |
| 1 | Unilamellar Liposomes (chemistry) |
| 1 | Uncertainty |
| 1 | Turkeys (metabolism) |
| 1 | Turkeys (growth & development) |
| 1 | Turkey (epidemiology) |
| 1 | Tumor Necrosis Factor-alpha (metabolism) |
| 1 | Trypsin (pharmacology) |
| 1 | Trypsin (chemistry) |
| 1 | Travel (legislation & jurisprudence) |
| 1 | Transportation |
| 1 | Transplantation, Heterologous |
| 1 | Transmissible gastroenteritis virus (ultrastructure) |
| 1 | Transmissible gastroenteritis virus (physiology) |
| 1 | Transmissible gastroenteritis virus (immunology) |
| 1 | Transmissible gastroenteritis virus (enzymology) |
| 1 | Transfection |
| 1 | Transcriptome |
| 1 | Transcription, Genetic |
| 1 | Transcription, Genetic (genetics) |
| 1 | Trachea |
| 1 | Trachea (pathology) |
| 1 | Trachea (enzymology) |
| 1 | Toxoplasmosis, Animal (pathology) |
| 1 | Toxoplasmosis, Animal (parasitology) |
| 1 | Toxoplasmosis, Animal (immunology) |
| 1 | Tonsillitis (virology) |
| 1 | Tonsillitis (epidemiology) |
| 1 | Tomography, X-Ray Computed (standards) |
| 1 | Toll-Like Receptor 7 (metabolism) |
| 1 | Toll-Like Receptor 7 (genetics) |
| 1 | Toll-Like Receptor 3 (immunology) |
| 1 | Toll-Like Receptor 3 (genetics) |
| 1 | Togaviridae Infections (veterinary) |
| 1 | Togaviridae Infections (diagnosis) |
| 1 | Time-to-Treatment |
| 1 | Tigers (virology) |
| 1 | Tigers (parasitology) |
| 1 | Tigers (microbiology) |
| 1 | Tigers (blood) |
| 1 | Ticks (microbiology) |
| 1 | Thyroid Gland |
| 1 | Thoracic Surgical Procedures |
| 1 | Thermodynamics |
| 1 | Th1 Cells |
| 1 | Temperature |
| 1 | Taq Polymerase (metabolism) |
| 1 | Taiwan |
| 1 | THP-1 Cells |
| 1 | TATA-Box Binding Protein (metabolism) |
