386 | Brazil |
344 | Humans |
235 | Influenza, Human |
221 | Female |
200 | Male |
146 | Middle Aged |
144 | Adult |
115 | Child, Preschool |
112 | Influenza A Virus, H1N1 Subtype |
110 | Adolescent |
107 | Aged |
103 | Infant |
101 | Child |
96 | Influenza Vaccines |
78 | Young Adult |
65 | Pandemics |
60 | Seasons |
58 | Vaccination |
54 | Animals |
54 | Aged, 80 and over |
53 | Respiratory Tract Infections |
50 | Infant, Newborn |
46 | Cross-Sectional Studies |
43 | Influenza A virus |
39 | Hospitalization |
39 | Disease Outbreaks |
34 | Risk Factors |
33 | Prospective Studies |
30 | Orthomyxoviridae Infections |
29 | Socioeconomic Factors |
29 | Prevalence |
29 | Pregnancy |
29 | Incidence |
28 | Antibodies, Viral |
26 | Time Factors |
24 | Reverse Transcriptase Polymerase Chain Reaction |
24 | Age Distribution |
23 | RNA, Viral |
22 | Phylogeny |
22 | Influenza B virus |
21 | Retrospective Studies |
21 | Acute Disease |
20 | Population Surveillance |
20 | Orthomyxoviridae |
20 | Hemagglutination Inhibition Tests |
19 | Antiviral Agents |
18 | Respiratory Syncytial Virus Infections |
17 | Virus Diseases |
16 | Swine |
16 | Swine Diseases |
16 | Severity of Illness Index |
15 | Influenza A Virus, H3N2 Subtype |
15 | Age Factors |
14 | Urban Population |
14 | Pregnancy Complications, Infectious |
14 | Oseltamivir |
13 | Pneumonia, Viral |
13 | Immunization Programs |
13 | History, 20th Century |
13 | Coinfection |
13 | Cohort Studies |
12 | Rhinovirus |
12 | Epidemiological Monitoring |
11 | Sequence Analysis, DNA |
11 | Respiratory Syncytial Viruses |
11 | Health Personnel |
11 | Coronavirus Infections |
10 | Nasopharynx |
10 | Molecular Sequence Data |
10 | Mass Vaccination |
10 | Hemagglutinin Glycoproteins, Influenza Virus |
10 | Comorbidity |
10 | Community-Acquired Infections |
9 | Treatment Outcome |
9 | Sex Distribution |
9 | Respiratory Tract Diseases |
9 | Respiratory Syncytial Virus, Human |
9 | Public Health |
9 | Paramyxoviridae Infections |
9 | Neuraminidase |
9 | Hospitals, University |
9 | Fluorescent Antibody Technique, Indirect |
8 | Viruses |
8 | Seroepidemiologic Studies |
8 | Real-Time Polymerase Chain Reaction |
8 | Pneumonia |
8 | Cross Infection |
8 | Betacoronavirus |
8 | Antigens, Viral |
7 | Tropical Climate |
7 | Tetanus Toxoid |
7 | Surveys and Questionnaires |
7 | Sentinel Surveillance |
7 | Polymerase Chain Reaction |
7 | Picornaviridae Infections |
7 | Mutation |
7 | Models, Biological |
7 | Mice |
7 | Logistic Models |
7 | Influenza in Birds |
7 | Health Status |
7 | Health Promotion |
7 | Health Knowledge, Attitudes, Practice |
7 | Haemophilus Vaccines |
7 | HIV Infections |
7 | Genetic Variation |
7 | Epidemics |
7 | Chronic Disease |
7 | Adenoviridae |
6 | Viral Load |
6 | Travel |
6 | Statistics, Nonparametric |
6 | Sex Factors |
6 | Risk Assessment |
6 | Pneumococcal Vaccines |
6 | Multivariate Analysis |
6 | Lung |
6 | Horses |
6 | Horse Diseases |
6 | Health Surveys |
6 | Health Services for the Aged |
6 | Genome, Viral |
6 | Drug Resistance, Viral |
6 | Case-Control Studies |
6 | Birds |
6 | Argentina |
6 | Adenovirus Infections, Human |
5 | United States |
5 | Serologic Tests |
5 | Respirovirus |
5 | Regression Analysis |
5 | Patient Compliance |
5 | Nasal Lavage Fluid |
5 | Metapneumovirus |
5 | Influenza A Virus, H3N8 Subtype |
5 | Influenza A Virus, H1N2 Subtype |
5 | Immunosuppressive Agents |
5 | Immunization Schedule |
5 | Genotype |
5 | Fever |
5 | Disease Notification |
5 | Cost-Benefit Analysis |
5 | Chi-Square Distribution |
5 | Cause of Death |
5 | Bird Diseases |
5 | Antibodies, Bacterial |
5 | Animal Migration |
4 | Zika Virus |
4 | Zika Virus Infection |
4 | Viral Proteins |
4 | Vaccines, Conjugate |
4 | Vaccines, Combined |
4 | Vaccination Coverage |
4 | Students, Medical |
4 | Spatio-Temporal Analysis |
4 | Severe Acute Respiratory Syndrome |
4 | Sensitivity and Specificity |
4 | Risk |
4 | Prognosis |
4 | Pregnancy Outcome |
4 | Pneumonia, Bacterial |
4 | Patient Acceptance of Health Care |
4 | Mortality |
4 | Morbidity |
4 | Molecular Epidemiology |
4 | Models, Statistical |
4 | Intensive Care Units |
4 | Indians, South American |
4 | Hospitals, Teaching |
4 | Hospital Mortality |
4 | Hemagglutination Tests |
4 | Health Policy |
4 | Haemophilus influenzae |
4 | Guideline Adherence |
4 | Gestational Age |
4 | Epidemiologic Methods |
4 | Disease Transmission, Infectious |
4 | Dengue |
4 | Death Certificates |
4 | Databases, Factual |
4 | Cough |
4 | Clinical Laboratory Techniques |
4 | Chile |
4 | Biomarkers |
4 | Animals, Wild |
4 | Adenoviridae Infections |
3 | Vaccines |
3 | Treatment Refusal |
3 | Tertiary Care Centers |
3 | Sus scrofa |
3 | South Africa |
3 | Ships |
3 | Self Report |
3 | Respiratory Distress Syndrome, Adult |
3 | Public Health Surveillance |
3 | Program Evaluation |
3 | Poisson Distribution |
3 | Pneumonia, Pneumococcal |
3 | Parainfluenza Virus 3, Human |
3 | Oropharynx |
3 | Occupational Diseases |
3 | Microscopy, Electron |
3 | Maternal Mortality |
3 | Mass Screening |
3 | Lupus Erythematosus, Systemic |
3 | Longitudinal Studies |
3 | Kidney Transplantation |
3 | Intensive Care Units, Pediatric |
3 | Information Dissemination |
3 | Infection Control |
3 | Immunocompromised Host |
3 | Hospitals |
3 | Hemagglutinins |
3 | Haemophilus influenzae type b |
3 | Haemophilus Infections |
3 | Follow-Up Studies |
3 | Fatal Outcome |
3 | Enzyme-Linked Immunosorbent Assay |
3 | Educational Status |
3 | Dogs |
3 | Diphtheria-Tetanus-Pertussis Vaccine |
3 | Data Collection |
3 | Cluster Analysis |
3 | Chick Embryo |
3 | CD4 Lymphocyte Count |
3 | Bronchoalveolar Lavage Fluid |
3 | Bacterial Infections |
3 | Australia |
3 | Attitude to Health |
3 | Attitude of Health Personnel |
3 | Asthma |
3 | Antibodies |
3 | Animal Husbandry |
3 | Amino Acid Substitution |
3 | Ambulatory Care |
3 | Adverse Drug Reaction Reporting Systems |
3 | Adenoviruses, Human |
3 | Absenteeism |
2 | Workplace |
2 | Weight Loss |
2 | Virus Cultivation |
2 | Virulence Factors |
2 | Vaccines, Inactivated |
2 | United Kingdom |
2 | USSR |
2 | Travel Medicine |
2 | Toxoplasmosis |
2 | Temperature |
2 | Technology Transfer |
2 | Streptococcus pneumoniae |
2 | Staphylococcus aureus |
2 | Spain |
2 | Social Media |
2 | Serotyping |
2 | Sequence Deletion |
2 | Sequence Analysis |
2 | Sanitation |
2 | Rural Population |
2 | Respiratory System |
2 | Respiratory Sounds |
2 | Respiration, Artificial |
2 | Respiration Disorders |
2 | Reproducibility of Results |
2 | Referral and Consultation |
2 | Receptors, CCR5 |
2 | Rain |
2 | Quality-Adjusted Life Years |
2 | Propolis |
2 | Prenatal Care |
2 | Premature Birth |
2 | Pregnant Women |
2 | Polymorphism, Single Nucleotide |
2 | Polymorphism, Genetic |
2 | Politics |
2 | Pneumococcal Infections |
2 | Plant Extracts |
2 | Physicians |
2 | Phylogeography |
2 | Parainfluenza Virus 2, Human |
2 | Outpatients |
2 | Outcome Assessment, Health Care |
2 | Odds Ratio |
2 | Nucleic Acid Denaturation |
2 | Nose |
2 | New Zealand |
2 | Neoplasms |
2 | Myocardial Ischemia |
2 | Mycoplasma hyopneumoniae |
2 | Multiplex Polymerase Chain Reaction |
2 | Military Personnel |
2 | Microcephaly |
2 | Methods |
2 | Meteorological Concepts |
2 | Meningitis, Haemophilus |
2 | Medication Adherence |
2 | Lung Diseases |
2 | Life Style |
2 | Leukocytes, Mononuclear |
2 | Length of Stay |
2 | Internet |
2 | Internationality |
2 | Influenzavirus B |
2 | Influenzavirus A |
2 | Influenza A Virus, H7N7 Subtype |
2 | Infectious Disease Transmission, Professional-to-Patient |
2 | Infectious Disease Transmission, Patient-to-Professional |
2 | Infections |
2 | Immunoglobulin G |
2 | Immunization |
2 | Hepatitis B |
2 | Hepatitis B Vaccines |
2 | Hemorrhagic Fever, Ebola |
2 | Hemagglutinins, Viral |
2 | Health Status Indicators |
2 | Health Education |
2 | Health Behavior |
2 | Global Health |
2 | Geriatric Assessment |
2 | Geography |
2 | Geography, Medical |
2 | Genetic Predisposition to Disease |
2 | Genes, Viral |
2 | Gene Frequency |
2 | France |
2 | Fourier Analysis |
2 | Fluorescent Antibody Technique |
2 | Feces |
2 | Farms |
2 | Ethnic Groups |
2 | Epitopes |
2 | Emergency Service, Hospital |
2 | Electronic Health Records |
2 | Double-Blind Method |
2 | Dose-Response Relationship, Immunologic |
2 | Disease Susceptibility |
2 | Disease Progression |
2 | Diphtheria-Tetanus-acellular Pertussis Vaccines |
2 | Diabetes Complications |
2 | Developing Countries |
2 | Decision Support Techniques |
2 | Datasets as Topic |
2 | DNA, Viral |
2 | Coronavirus |
2 | Complement Fixation Tests |
2 | Communicable Diseases |
2 | Communicable Disease Control |
2 | Colombia |
2 | Climate |
2 | Chromatography, High Pressure Liquid |
2 | China |
2 | Charadriiformes |
2 | Cerebrovascular Disorders |
2 | Cerebrospinal Fluid |
2 | Cell Line |
2 | Cell Culture Techniques |
2 | Carrier State |
2 | C-Reactive Protein |
2 | Bronchiolitis |
2 | Breast Feeding |
2 | Base Sequence |
2 | Bacterial Vaccines |
2 | BCG Vaccine |
2 | Avulavirus |
2 | Avulavirus Infections |
2 | Asymptomatic Diseases |
2 | Air Pollution |
2 | Air Pollutants |
1 | Yellow Fever |
1 | Yellow Fever Vaccine |
1 | World War I |
1 | World Health Organization |
1 | Workforce |
1 | Women, Working |
1 | Women's Health |
1 | West Nile virus |
1 | West Nile Fever |
1 | Weather |
1 | Weaning |
1 | Wavelet Analysis |
1 | Vulnerable Populations |
1 | Volunteers |
1 | Virus Shedding |
1 | Virus Replication |
1 | Virulence |
1 | Virology |
1 | Viral Vaccines |
1 | Viral Plaque Assay |
1 | Viral Matrix Proteins |
1 | Viral Envelope Proteins |
1 | Victoria |
1 | Venezuela |
1 | Vaccines, Attenuated |
1 | Vaccination Refusal |
1 | Uterus |
1 | Urinary Tract Infections |
1 | Urban Health |
1 | Universities |
1 | Typhoid Fever |
1 | Turkey |
1 | Tumor Necrosis Factor-alpha |
1 | Tuberculosis |
1 | Tuberculosis, Pulmonary |
1 | Tropical Medicine |
1 | Transportation of Patients |
1 | Transplant Recipients |
1 | Transition Temperature |
1 | Transformation, Bacterial |
1 | Toxoplasma |
1 | Topography, Medical |
1 | Ticks |
1 | Third-Party Consent |
1 | Thimerosal |
1 | Thailand |
1 | Tetanus |
1 | Telephone |
1 | Telemedicine |
1 | Technology, Pharmaceutical |
1 | Taiwan |
1 | Tacrolimus |
1 | Tachypnea |
1 | Syphilis |
1 | Syndrome |
1 | Sympatry |
1 | Sunlight |
1 | Substance Abuse, Intravenous |
1 | Students |
1 | Structure-Activity Relationship |
1 | Stochastic Processes |
1 | Squalene |
1 | Sputum |
1 | Sports |
1 | Spirometry |
1 | Spinal Cord Diseases |
1 | Spheniscidae |
1 | Species Specificity |
1 | Societies, Medical |
1 | Social Support |
1 | Social Perception |
1 | Social Isolation |
1 | Social Conditions |
1 | Social Class |
1 | Smoking |
1 | Smartphone |
1 | Skin Tests |
1 | Sirolimus |
1 | Singapore |
1 | Sick Leave |
1 | Sialyltransferases |
1 | Shock, Septic |
1 | Sexual Behavior |
1 | Sex Characteristics |
1 | Sequence Analysis, RNA |
1 | Self Medication |
1 | Scotland |
1 | Schools |
1 | Schizophrenia |
1 | Russia |
1 | Risk Reduction Behavior |
1 | Rhabdomyolysis |
1 | Respirovirus Infections |
1 | Respiratory Insufficiency |
1 | Respiratory Hypersensitivity |
1 | Residence Characteristics |
1 | Research Design |
1 | Renal Insufficiency |
1 | Renal Dialysis |
1 | Religion |
1 | Reference Values |
1 | Recombinant Proteins |
1 | Reassortant Viruses |
1 | Reagent Kits, Diagnostic |
1 | Rats |
1 | Rats, Wistar |
1 | Randomized Controlled Trials as Topic |
1 | Radiography |
1 | Radiography, Thoracic |
1 | ROC Curve |
1 | RNA |
1 | RNA Viruses |
1 | RNA Virus Infections |
1 | Quality Indicators, Health Care |
1 | Quality Control |
1 | Qualitative Research |
1 | Q Fever |
1 | Pulmonary Disease, Chronic Obstructive |
1 | Publishing |
1 | Public Sector |
1 | Public Policy |
1 | Public Opinion |
1 | Psychosocial Deprivation |
1 | Prostatic Neoplasms |
1 | Principal Component Analysis |
1 | Primary Health Care |
1 | Primary Cell Culture |
1 | Preventive Medicine |
1 | Preservatives, Pharmaceutical |
1 | Prenatal Exposure Delayed Effects |
1 | Pregnancy Trimester, Third |
1 | Pregnancy Complications |
1 | Predictive Value of Tests |