110 | Humans |
70 | Belgium (epidemiology) |
67 | Male |
66 | Female |
60 | Belgium |
48 | Adult |
47 | Middle Aged |
46 | Aged |
45 | Influenza, Human (epidemiology) |
33 | Influenza, Human (prevention & control) |
28 | Animals |
25 | Adolescent |
24 | Young Adult |
23 | Aged, 80 and over |
21 | Child |
20 | Influenza Vaccines (administration & dosage) |
20 | Child, Preschool |
16 | Infant |
14 | Surveys and Questionnaires |
14 | Seasons |
14 | Influenza, Human (virology) |
14 | Influenza, Human (diagnosis) |
13 | Influenza in Birds (epidemiology) |
13 | Influenza A virus (isolation & purification) |
11 | Risk Factors |
11 | Retrospective Studies |
11 | Cross-Sectional Studies |
10 | Incidence |
9 | Vaccination (statistics & numerical data) |
9 | Sensitivity and Specificity |
9 | Prevalence |
9 | Infant, Newborn |
8 | Vaccination |
8 | Time Factors |
8 | Influenza Vaccines |
8 | Influenza A virus (immunology) |
8 | Influenza A Virus, H1N1 Subtype |
8 | Disease Outbreaks |
7 | Sentinel Surveillance |
7 | Prospective Studies |
7 | Influenza in Birds (virology) |
7 | Disease Outbreaks (statistics & numerical data) |
7 | Disease Outbreaks (prevention & control) |
7 | Antibodies, Viral (blood) |
6 | Swine |
6 | Seroepidemiologic Studies |
6 | Pregnancy |
6 | Population Surveillance (methods) |
6 | Orthomyxoviridae Infections (veterinary) |
6 | Orthomyxoviridae Infections (epidemiology) |
6 | Netherlands (epidemiology) |
6 | Logistic Models |
6 | Influenza, Human (immunology) |
6 | Influenza Vaccines (adverse effects) |
6 | Disease Outbreaks (veterinary) |
6 | Antiviral Agents (therapeutic use) |
6 | Age Factors |
5 | Virus Diseases (epidemiology) |
5 | Socioeconomic Factors |
5 | Respiratory Tract Infections (epidemiology) |
5 | Poultry |
5 | Pandemics |
5 | Orthomyxoviridae (isolation & purification) |
5 | Netherlands |
5 | Influenza, Human (drug therapy) |
5 | Influenza Vaccines (immunology) |
5 | Health Knowledge, Attitudes, Practice |
5 | Cohort Studies |
5 | Attitude of Health Personnel |
4 | Risk Assessment |
4 | Regression Analysis |
4 | Population Surveillance |
4 | Phylogeny |
4 | Patient Acceptance of Health Care |
4 | Multivariate Analysis |
4 | Influenza, Human (therapy) |
4 | Influenza, Human (mortality) |
4 | Influenza, Human (economics) |
4 | Influenza Vaccines (therapeutic use) |
4 | Influenza A Virus, H5N1 Subtype |
4 | Influenza A Virus, H1N1 Subtype (immunology) |
4 | Hemagglutination Inhibition Tests |
4 | Germany (epidemiology) |
4 | France (epidemiology) |
4 | Europe (epidemiology) |
4 | Epidemiological Monitoring |
4 | Enzyme-Linked Immunosorbent Assay (veterinary) |
4 | Diagnosis, Differential |
4 | Birds |
4 | Antibodies, Viral (analysis) |
4 | Age Distribution |
3 | Virus Diseases (virology) |
3 | Vaccination (psychology) |
3 | Vaccination (economics) |
3 | Travel |
3 | Switzerland (epidemiology) |
3 | Swine Diseases (virology) |
3 | Swine Diseases (epidemiology) |
3 | Statistics, Nonparametric |
3 | Respiratory Tract Infections (virology) |
3 | Respiratory Tract Diseases (epidemiology) |
3 | Respiratory Syncytial Viruses (isolation & purification) |
3 | Pregnancy Complications, Infectious (prevention & control) |
3 | Pneumococcal Vaccines |
3 | Oseltamivir (therapeutic use) |
3 | Orthomyxoviridae Infections (virology) |
3 | Odds Ratio |
3 | Nursing Homes |
3 | Nasopharynx (virology) |
3 | Models, Theoretical |
3 | Models, Statistical |
3 | Internet |
3 | Intensive Care Units (statistics & numerical data) |
3 | Influenza, Human (transmission) |
3 | Influenza, Human (psychology) |
3 | Influenza, Human (complications) |
3 | Influenza in Birds (prevention & control) |
3 | Influenza B virus (isolation & purification) |
3 | Influenza B virus (immunology) |
3 | Influenza A virus (genetics) |
3 | Influenza A Virus, H5N1 Subtype (pathogenicity) |
3 | Influenza A Virus, H5N1 Subtype (isolation & purification) |
3 | Influenza A Virus, H5N1 Subtype (genetics) |
3 | Influenza A Virus, H1N1 Subtype (isolation & purification) |
3 | Influenza A Virus, H1N1 Subtype (genetics) |
3 | Immunization Schedule |
3 | Hospitals |
3 | Hospitalization |
3 | Health Surveys |
3 | Genetic Variation |
3 | Educational Status |
3 | Drug-Related Side Effects and Adverse Reactions (pathology) |
3 | Drug-Related Side Effects and Adverse Reactions (epidemiology) |
3 | Denmark (epidemiology) |
3 | Data Collection |
3 | Communicable Disease Control (methods) |
3 | Chi-Square Distribution |
3 | Antibodies, Bacterial (blood) |
2 | alpha-Tocopherol (administration & dosage) |
2 | Whooping Cough (prevention & control) |
2 | Virulence |
2 | Virology (methods) |
2 | Vaccines, Inactivated |
2 | Vaccination Coverage (statistics & numerical data) |
2 | Vaccination (methods) |
2 | United Kingdom (epidemiology) |
2 | Treatment Outcome |
2 | Tetanus Toxoid (immunology) |
2 | Tetanus Toxoid (adverse effects) |
2 | Tetanus Toxoid (administration & dosage) |
2 | Survival Analysis |
2 | Students, Medical |
2 | Streptococcus pneumoniae (isolation & purification) |
2 | Squalene (administration & dosage) |
2 | Social Behavior |
2 | Smoking Prevention |
2 | Smoking (legislation & jurisprudence) |
2 | Serotyping |
2 | Risk |
2 | Risk Assessment (methods) |
2 | Renal Dialysis |
2 | Real-Time Polymerase Chain Reaction |
2 | Random Allocation |
2 | RNA, Viral (genetics) |
2 | Public Health |
2 | Pseudorabies (epidemiology) |
2 | Probability |
2 | Primary Health Care (methods) |
2 | Preventive Health Services (statistics & numerical data) |
2 | Pregnant Women |
2 | Predictive Value of Tests |
2 | Practice Patterns, Physicians' |
2 | Practice Guidelines as Topic |
2 | Poultry Diseases (virology) |
2 | Poultry Diseases (epidemiology) |
2 | Portugal (epidemiology) |
2 | Population Control (methods) |
2 | Polysorbates (administration & dosage) |
2 | Polymerase Chain Reaction |
2 | Pilot Projects |
2 | Physicians, Family |
2 | Pharmacies |
2 | Patient Admission (statistics & numerical data) |
2 | Patient Acceptance of Health Care (statistics & numerical data) |
2 | Nasal Mucosa (virology) |
2 | Molecular Sequence Data |
2 | Molecular Epidemiology (methods) |
2 | Molecular Diagnostic Techniques (methods) |
2 | Models, Economic |
2 | Military Personnel (education) |
2 | Japan (epidemiology) |
2 | Italy (epidemiology) |
2 | Invasive Pulmonary Aspergillosis (epidemiology) |
2 | Interviews as Topic |
2 | Injections, Intradermal |
2 | Influenza, Human (microbiology) |
2 | Influenza in Birds (transmission) |
2 | Influenza A virus |
2 | Influenza A virus (pathogenicity) |
2 | Influenza A virus (classification) |
2 | Influenza A Virus, H7N7 Subtype (pathogenicity) |
2 | Influenza A Virus, H5N1 Subtype (classification) |
2 | Influenza A Virus, H3N2 Subtype (pathogenicity) |
2 | Influenza A Virus, H1N1 Subtype (pathogenicity) |
2 | Infection Control (methods) |
2 | Immunization Programs |
2 | Immunization (statistics & numerical data) |
2 | Hospitals, University |
2 | Hemagglutination Tests (veterinary) |
2 | Health Services Needs and Demand |
2 | Health Personnel |
2 | Health Personnel (psychology) |
2 | Haemophilus Vaccines (immunology) |
2 | Haemophilus Vaccines (adverse effects) |
2 | Haemophilus Vaccines (administration & dosage) |
2 | Guideline Adherence (statistics & numerical data) |
2 | Germany |
2 | General Practitioners |
2 | Gastrointestinal Diseases (epidemiology) |
2 | France |
2 | Forecasting |
2 | Follow-Up Studies |
2 | Family Practice (standards) |
2 | Family Practice (methods) |
2 | Extracorporeal Membrane Oxygenation |
2 | Evaluation Studies as Topic |
2 | Epidemics |
2 | England (epidemiology) |
2 | Emergency Service, Hospital (statistics & numerical data) |
2 | Drug Combinations |
2 | Disaster Planning |
2 | Diphtheria-Tetanus-Pertussis Vaccine (immunology) |
2 | Diphtheria-Tetanus-Pertussis Vaccine (adverse effects) |
2 | Diphtheria-Tetanus-Pertussis Vaccine (administration & dosage) |
2 | Decision Making |
2 | Czech Republic (epidemiology) |
2 | Cross Infection (prevention & control) |
2 | Croatia |
2 | Cost-Benefit Analysis |
2 | Communicable Diseases (transmission) |
2 | Communicable Disease Control (organization & administration) |
2 | Case-Control Studies |
2 | Bird Diseases (epidemiology) |
2 | Biomarkers (blood) |
2 | Austria |
2 | Antibodies, Viral (isolation & purification) |
2 | Antibodies, Neutralizing (blood) |
2 | Anti-Bacterial Agents (therapeutic use) |
2 | Anseriformes (virology) |
2 | Animal Husbandry |
1 | alpha-Tocopherol (adverse effects) |
1 | Zoonoses |
1 | Zoonoses (transmission) |
1 | Zoonoses (epidemiology) |
1 | Zanamivir (therapeutic use) |
1 | Yersinia enterocolitica (isolation & purification) |
1 | World War I |
1 | World Health Organization |
1 | Workplace |
1 | Wales (epidemiology) |
1 | Viruses (isolation & purification) |
1 | Viruses (classification) |
1 | Virus Diseases (veterinary) |
1 | Virus Diseases (prevention & control) |
1 | Virus Diseases (pathology) |
1 | Viral Vaccines |
1 | Viral Load (methods) |
1 | Ventricular Dysfunction, Right (virology) |
1 | Ventricular Dysfunction, Right (therapy) |
1 | Ventricular Dysfunction, Right (epidemiology) |
1 | Ventricular Dysfunction, Right (diagnostic imaging) |
1 | Ventricular Dysfunction, Left (virology) |
1 | Ventricular Dysfunction, Left (therapy) |
1 | Ventricular Dysfunction, Left (epidemiology) |
1 | Ventricular Dysfunction, Left (diagnostic imaging) |
1 | Vaginal Smears (statistics & numerical data) |
1 | Vaccines, Inactivated (immunology) |
1 | Vaccines, Inactivated (administration & dosage) |
1 | Vaccines, Conjugate (therapeutic use) |
1 | Vaccines, Conjugate (immunology) |
1 | Vaccines, Conjugate (adverse effects) |
1 | Vaccines, Conjugate (administration & dosage) |
1 | Vaccines, Combined (therapeutic use) |
1 | Vaccines, Combined (immunology) |
1 | Vaccines, Combined (adverse effects) |
1 | Vaccines, Attenuated |
1 | Vaccines, Attenuated (administration & dosage) |
1 | Vaccination (trends) |
1 | Vaccination (standards) |
1 | Uterine Cervical Neoplasms (prevention & control) |
1 | United Kingdom |
1 | Uncertainty |
1 | Turkeys (virology) |
1 | Turkey |
1 | Travel (statistics & numerical data) |
1 | Transmissible gastroenteritis virus (isolation & purification) |
1 | Transmissible gastroenteritis virus (immunology) |
1 | Touch |
1 | Tobacco Smoke Pollution (prevention & control) |
1 | Tobacco Smoke Pollution (legislation & jurisprudence) |
1 | Thailand |
1 | Text Messaging |
1 | Tetanus Toxoid |
1 | Tertiary Care Centers |
1 | Temperature |
1 | Syringes |
1 | Swine Diseases (etiology) |
1 | Swine Diseases (blood) |
1 | Swine (microbiology) |
1 | Sweden (epidemiology) |
1 | Survival Rate (trends) |
1 | Superinfection (etiology) |
1 | Superinfection (epidemiology) |
1 | Streptococcus pneumoniae (immunology) |
1 | Streptococcus pneumoniae (drug effects) |
1 | Statistics as Topic |
1 | Staphylococcus aureus (isolation & purification) |
1 | Staphylococcus aureus (drug effects) |
1 | Squalene (adverse effects) |
1 | Specimen Handling (standards) |
1 | Specimen Handling (methods) |
1 | Spain |
1 | Spain (epidemiology) |
1 | Space-Time Clustering |
1 | Social Networking |
1 | Smoking Cessation (legislation & jurisprudence) |
1 | Smoking (mortality) |
1 | Smoking (epidemiology) |
1 | Smoking (adverse effects) |
1 | Smoke-Free Policy (legislation & jurisprudence) |
1 | Slovenia (epidemiology) |
1 | Slovakia (epidemiology) |
1 | Single-Blind Method |
1 | Sex Factors |
1 | Severe Acute Respiratory Syndrome (epidemiology) |
1 | Serotyping (methods) |
1 | Serologic Tests |
1 | Sequence Analysis |
1 | Sequence Analysis, RNA |
1 | Sequence Analysis, DNA (veterinary) |
1 | Self Report |
1 | Scotland (epidemiology) |
1 | Schools |
1 | Safety |
1 | Safety Management (organization & administration) |
1 | SARS Virus |
1 | Rural Population |
1 | Rotavirus (isolation & purification) |
1 | Romania (epidemiology) |
1 | Risk Management (organization & administration) |
1 | Reverse Transcriptase Polymerase Chain Reaction |
1 | Reverse Transcriptase Polymerase Chain Reaction (veterinary) |
1 | Reverse Transcriptase Polymerase Chain Reaction (statistics & numerical data) |
1 | Restaurants |
1 | Respirovirus Infections (prevention & control) |
1 | Respirovirus Infections (epidemiology) |
1 | Respirovirus (isolation & purification) |
1 | Respiratory Tract Infections (veterinary) |
1 | Respiratory Tract Infections (prevention & control) |
1 | Respiratory Tract Infections (etiology) |
1 | Respiratory Tract Diseases (virology) |
1 | Respiratory Tract Diseases (veterinary) |
1 | Respiratory Tract Diseases (pathology) |
1 | Respiratory Tract Diseases (microbiology) |
1 | Respiratory Tract Diseases (drug therapy) |
1 | Respiratory Tract Diseases (diagnosis) |
1 | Respiratory Syncytial Virus, Human (genetics) |
1 | Respiratory Syncytial Virus Infections (virology) |
1 | Respiratory Syncytial Virus Infections (epidemiology) |
1 | Respiratory Distress Syndrome, Adult (virology) |
1 | Respiratory Distress Syndrome, Adult (drug therapy) |
1 | Reproducibility of Results |
1 | Reminder Systems |
1 | Registries |
1 | Registries (statistics & numerical data) |
1 | Real-Time Polymerase Chain Reaction (veterinary) |
1 | Reagent Kits, Diagnostic |
1 | Reagent Kits, Diagnostic (veterinary) |
1 | Reagent Kits, Diagnostic (standards) |
1 | Raptors (virology) |
1 | ROC Curve |
1 | RNA, Ribosomal, 16S (genetics) |
1 | Quality-Adjusted Life Years |
1 | Quality of Life |
1 | Quality of Health Care |
1 | Quality of Health Care (organization & administration) |
1 | Qualitative Research |
1 | Pulmonary Disease, Chronic Obstructive (drug therapy) |
1 | Public Health Surveillance |
1 | Public Health Practice |
1 | Public Health Informatics (methods) |
1 | Public Health (statistics & numerical data) |
1 | Public Health (economics) |
1 | Pseudorabies (immunology) |
1 | Protein Conformation |
1 | Program Evaluation |
1 | Prognosis |
1 | Product Surveillance, Postmarketing (methods) |
1 | Probiotics (administration & dosage) |
1 | Primary Health Care |
1 | Primary Health Care (statistics & numerical data) |
1 | Primary Health Care (standards) |
1 | Primary Health Care (organization & administration) |
1 | Preventive Health Services (standards) |
1 | Preventive Health Services (economics) |
1 | Premature Birth (epidemiology) |
1 | Pregnancy Trimesters |
1 | Pregnancy Trimester, Third |
1 | Pregnancy Complications, Infectious (therapy) |
1 | Pregnancy Complications, Infectious (epidemiology) |
1 | Pregnancy Complications, Infectious (diagnosis) |
1 | Pre-Exposure Prophylaxis (methods) |
1 | Practice Patterns, Physicians' (standards) |
1 | Poultry (virology) |
1 | Postpartum Period |
1 | Portugal |
1 | Polysorbates (adverse effects) |
1 | Polymerase Chain Reaction (methods) |
1 | Poland (epidemiology) |
1 | Poisson Distribution |
1 | Point-of-Care Systems |
1 | Pneumonia, Viral (virology) |
1 | Pneumonia, Viral (prevention & control) |
1 | Pneumonia, Viral (epidemiology) |
1 | Pneumonia, Viral (drug therapy) |
1 | Pneumonia, Pneumococcal (therapy) |
1 | Pneumonia, Pneumococcal (prevention & control) |
1 | Pneumonia, Pneumococcal (physiopathology) |
1 | Pneumonia, Pneumococcal (epidemiology) |
1 | Pneumonia, Pneumococcal (diagnosis) |
1 | Pneumonia, Bacterial (drug therapy) |
1 | Pneumonia, Bacterial (diagnosis) |
1 | Pneumonia of Swine, Mycoplasmal (veterinary) |
1 | Pneumonia of Swine, Mycoplasmal (immunology) |
1 | Pneumonia of Swine, Mycoplasmal (epidemiology) |
1 | Pneumonia (psychology) |
1 | Pneumonia (history) |
1 | Pneumonia (ethnology) |
1 | Pneumococcal Vaccines (therapeutic use) |
1 | Pneumococcal Vaccines (immunology) |
1 | Pneumococcal Vaccines (adverse effects) |
1 | Pneumococcal Vaccines (administration & dosage) |
1 | Placebos (administration & dosage) |
1 | Phylogeography |
1 | Photography (history) |
1 | Photography (education) |
1 | Pharynx (virology) |
1 | Pharmaceutical Preparations (administration & dosage) |
1 | Pets |
1 | Pertussis Vaccine (therapeutic use) |
1 | Pertussis Vaccine (administration & dosage) |
1 | Personnel, Hospital |
1 | Percutaneous Coronary Intervention (methods) |
1 | Perception |
1 | Patient-Centered Care (statistics & numerical data) |
1 | Patient-Centered Care (organization & administration) |
1 | Patient Satisfaction |
1 | Patient Safety (standards) |
1 | Patient Preference |
1 | Patient Acceptance of Health Care (psychology) |
1 | Parvoviridae Infections (epidemiology) |
1 | Parvoviridae Infections (diagnosis) |
1 | Paris (epidemiology) |
1 | Papanicolaou Test |
1 | Pandemics (economics) |
1 | Ownership (statistics & numerical data) |
1 | Oseltamivir |
1 | Oseltamivir (administration & dosage) |
1 | Orthomyxoviridae Infections (microbiology) |
1 | Orthomyxoviridae Infections (immunology) |
1 | Orthomyxoviridae (pathogenicity) |
1 | Orthomyxoviridae (immunology) |
1 | Orthomyxoviridae (growth & development) |
1 | Orthomyxoviridae (genetics) |
1 | Orthomyxoviridae (classification) |
1 | Opportunistic Infections (microbiology) |
1 | Online Systems |
1 | Nursing Homes (statistics & numerical data) |
1 | Nucleic Acid Amplification Techniques |
1 | Norway (epidemiology) |
1 | Northern Ireland (epidemiology) |
1 | Nonlinear Dynamics |
1 | Nocardia Infections (diagnosis) |
1 | Nocardia (isolation & purification) |
1 | Nocardia (genetics) |
1 | Newspapers as Topic |
1 | Neutralization Tests |
1 | Neuraminidase (metabolism) |
1 | Neuraminidase (immunology) |
1 | Nervous System Diseases (pathology) |
1 | Nervous System Diseases (epidemiology) |
1 | Nervous System Diseases (drug therapy) |
1 | Nervous System Diseases (diagnosis) |
1 | National Health Programs |
1 | National Health Programs (legislation & jurisprudence) |
1 | Nasopharynx (microbiology) |
1 | Myocardial Infarction (surgery) |
1 | Myocardial Infarction (prevention & control) |
1 | Myocardial Infarction (mortality) |
1 | Myocardial Infarction (etiology) |