779 | Spain |
728 | Humans |
528 | Influenza, Human |
489 | Female |
469 | Male |
338 | Adult |
332 | Middle Aged |
323 | Aged |
264 | Adolescent |
257 | Influenza Vaccines |
234 | Influenza A Virus, H1N1 Subtype |
191 | Child |
178 | Vaccination |
177 | Child, Preschool |
172 | Young Adult |
170 | Aged, 80 and over |
162 | Infant |
117 | Hospitalization |
113 | Seasons |
110 | Pandemics |
108 | Risk Factors |
99 | Disease Outbreaks |
93 | Cross-Sectional Studies |
86 | Prospective Studies |
73 | Infant, Newborn |
68 | Incidence |
66 | Case-Control Studies |
62 | Population Surveillance |
61 | Time Factors |
61 | Animals |
52 | Retrospective Studies |
51 | Influenza A virus |
50 | Age Factors |
46 | Logistic Models |
44 | Influenza A Virus, H3N2 Subtype |
43 | Treatment Outcome |
42 | Sentinel Surveillance |
42 | Respiratory Tract Infections |
42 | Primary Health Care |
41 | Pregnancy |
40 | Comorbidity |
40 | Cohort Studies |
40 | Antiviral Agents |
39 | Surveys and Questionnaires |
39 | Health Personnel |
32 | Prevalence |
32 | Patient Acceptance of Health Care |
32 | Influenza B virus |
32 | Community-Acquired Infections |
28 | Intensive Care Units |
26 | Socioeconomic Factors |
26 | Severity of Illness Index |
25 | Mortality |
25 | Health Knowledge, Attitudes, Practice |
25 | Age Distribution |
24 | Pneumonia, Viral |
24 | Attitude of Health Personnel |
23 | Swine |
23 | Odds Ratio |
23 | Influenza in Birds |
23 | Antibodies, Viral |
22 | Virus Diseases |
22 | Pneumonia |
22 | Length of Stay |
21 | Immunization Programs |
21 | History, 20th Century |
20 | Swine Diseases |
20 | Pulmonary Disease, Chronic Obstructive |
20 | Pneumococcal Vaccines |
20 | Oseltamivir |
20 | Orthomyxoviridae Infections |
19 | Sex Factors |
19 | Registries |
19 | Phylogeny |
19 | Health Surveys |
18 | Reverse Transcriptase Polymerase Chain Reaction |
18 | Prognosis |
17 | Urban Population |
17 | Molecular Sequence Data |
17 | Hospital Mortality |
17 | Emergency Service, Hospital |
17 | Cross Infection |
16 | Survival Analysis |
16 | Pregnancy Complications, Infectious |
16 | Anti-Bacterial Agents |
15 | Vaccination Coverage |
15 | Sensitivity and Specificity |
15 | Risk Assessment |
15 | Regression Analysis |
15 | Patient Admission |
15 | Hospitals, University |
15 | Epidemics |
15 | Cause of Death |
15 | Birds |
15 | Air Pollution |
14 | Seroepidemiologic Studies |
14 | Sequence Analysis, DNA |
14 | Polymerase Chain Reaction |
14 | Nasopharynx |
14 | Multivariate Analysis |
14 | Models, Statistical |
13 | Respiratory Syncytial Virus Infections |
13 | Respiration, Artificial |
13 | Public Health |
13 | Orthomyxoviridae |
13 | Immunization Schedule |
13 | Health Care Surveys |
13 | Air Pollutants |
12 | Smoking |
12 | Sex Distribution |
12 | Risk |
12 | Poisson Distribution |
12 | Mass Vaccination |
12 | Longitudinal Studies |
12 | Inpatients |
12 | Critical Care |
12 | Confidence Intervals |
12 | Coinfection |
11 | Viral Proteins |
11 | Travel |
11 | Hemagglutination Inhibition Tests |
11 | Bacterial Infections |
10 | Temperature |
10 | Respiratory Tract Diseases |
10 | RNA, Viral |
10 | Practice Guidelines as Topic |
10 | Pneumonia, Pneumococcal |
10 | Pneumonia, Bacterial |
10 | Health Promotion |
10 | Europe |
10 | Drug Utilization |
10 | Data Collection |
10 | Communicable Diseases |
10 | Chronic Disease |
10 | Cardiovascular Diseases |
10 | Asthma |
10 | Acute Disease |
9 | Vaccines |
9 | United States |
9 | Survival Rate |
9 | Personnel, Hospital |
9 | Patient Compliance |
9 | Obesity |
9 | Interviews as Topic |
9 | Infection Control |
9 | Hemagglutinin Glycoproteins, Influenza Virus |
9 | Health Status |
9 | Follow-Up Studies |
9 | Disease Notification |
9 | Critical Illness |
9 | Antigens, Viral |
8 | Viruses |
8 | Statistics, Nonparametric |
8 | Social Class |
8 | Respiratory Syncytial Virus, Human |
8 | Real-Time Polymerase Chain Reaction |
8 | Pneumococcal Infections |
8 | Particulate Matter |
8 | Outcome Assessment, Health Care |
8 | Neuraminidase |
8 | Models, Theoretical |
8 | Internet |
8 | Influenza A Virus, H5N1 Subtype |
8 | Immunization |
8 | Hospitals |
8 | HIV Infections |
8 | Global Health |
8 | Enzyme-Linked Immunosorbent Assay |
8 | Electronic Health Records |
8 | Cost-Benefit Analysis |
8 | Communicable Disease Control |
8 | Attitude to Health |
8 | Animals, Wild |
7 | Urban Health |
7 | Proportional Hazards Models |
7 | Pregnant Women |
7 | Mutation |
7 | Influenzavirus C |
7 | Epidemiological Monitoring |
7 | Environmental Exposure |
7 | Databases, Factual |
7 | Costs and Cost Analysis |
7 | Absenteeism |
6 | Viral Load |
6 | United Kingdom |
6 | Tertiary Care Centers |
6 | Streptococcus pneumoniae |
6 | Sick Leave |
6 | Self Report |
6 | Respiratory Insufficiency |
6 | Program Evaluation |
6 | Preventive Health Services |
6 | Outpatients |
6 | Occupational Exposure |
6 | Nurses |
6 | Lung |
6 | Life Style |
6 | Immunocompromised Host |
6 | Hong Kong |
6 | Health Behavior |
6 | Haemophilus Vaccines |
6 | Genotype |
6 | Forecasting |
6 | Feces |
6 | Family Characteristics |
6 | Environmental Monitoring |
6 | Emigrants and Immigrants |
6 | Educational Status |
6 | Cost of Illness |
6 | Clinical Laboratory Techniques |
6 | Bronchitis |
6 | Bayes Theorem |
6 | Base Sequence |
6 | Amino Acid Substitution |
6 | Adrenal Cortex Hormones |
6 | Adjuvants, Immunologic |
5 | Viral Vaccines |
5 | Vaccines, Inactivated |
5 | Vaccine Potency |
5 | Sulfur Dioxide |
5 | Squalene |
5 | Species Specificity |
5 | Sequence Alignment |
5 | Schools |
5 | Rural Population |
5 | ROC Curve |
5 | Predictive Value of Tests |
5 | Poultry |
5 | Polysorbates |
5 | Occupational Health |
5 | Multiplex Polymerase Chain Reaction |
5 | Motivation |
5 | Molecular Epidemiology |
5 | Lung Diseases |
5 | Infectious Disease Transmission, Professional-to-Patient |
5 | Infections |
5 | Humidity |
5 | History, 19th Century |
5 | Health Services |
5 | Guidelines as Topic |
5 | France |
5 | Fever |
5 | Drug Resistance, Viral |
5 | Diabetes Mellitus |
5 | Delivery of Health Care |
5 | Combined Modality Therapy |
5 | Cluster Analysis |
5 | Chi-Square Distribution |
5 | Canada |
5 | Bird Diseases |
5 | Bacterial Vaccines |
5 | Amino Acid Sequence |
5 | Algorithms |
5 | Alcohol Drinking |
5 | APACHE |
4 | Workforce |
4 | Whooping Cough |
4 | Viral Fusion Proteins |
4 | Treatment Refusal |
4 | Sus scrofa |
4 | Space-Time Clustering |
4 | Russia |
4 | Rhinovirus |
4 | Public Health Surveillance |
4 | Probability |
4 | Practice Patterns, Physicians' |
4 | Population Dynamics |
4 | Point-of-Care Systems |
4 | Pilot Projects |
4 | Pharynx |
4 | Periodicity |
4 | Parvoviridae Infections |
4 | Particle Size |
4 | Occupational Diseases |
4 | Mutation, Missense |
4 | Multicenter Studies as Topic |
4 | Metapneumovirus |
4 | Linear Models |
4 | Laboratories |
4 | Immunoassay |
4 | Immunization, Secondary |
4 | Hospitals, Pediatric |
4 | Hospitals, General |
4 | Homes for the Aged |
4 | Hepatitis B |
4 | Hemagglutinins, Viral |
4 | Hand Disinfection |
4 | Haemophilus influenzae type b |
4 | Haemophilus Infections |
4 | Guideline Adherence |
4 | Geography |
4 | Genetic Variation |
4 | Evaluation Studies as Topic |
4 | European Union |
4 | Emergencies |
4 | Drug Prescriptions |
4 | Disease Progression |
4 | Diabetes Complications |
4 | Cross-Over Studies |
4 | Chickens |
4 | C-Reactive Protein |
4 | Biomarkers |
4 | Antibodies, Bacterial |
4 | Analysis of Variance |
4 | Ambulatory Care |
3 | Zoonoses |
3 | Weather |
3 | Weaning |
3 | Virology |
3 | Viremia |
3 | Tuberculosis, Pulmonary |
3 | Tetanus Toxoid |
3 | Terminology as Topic |
3 | Sweden |
3 | Students, Nursing |
3 | Students, Medical |
3 | Spirometry |
3 | Shock |
3 | Serotyping |
3 | Salmonella |
3 | Salmonella Infections, Animal |
3 | Respiratory Syncytial Viruses |
3 | Research Design |
3 | Reproducibility of Results |
3 | Reassortant Viruses |
3 | Reagent Kits, Diagnostic |
3 | RNA-Binding Proteins |
3 | Quality of Life |
3 | Pseudorabies |
3 | Product Surveillance, Postmarketing |
3 | Primary Prevention |
3 | Primary Nursing |
3 | Preventive Medicine |
3 | Porcine respiratory and reproductive syndrome virus |
3 | Porcine Reproductive and Respiratory Syndrome |
3 | Population |
3 | Poland |
3 | Pertussis Vaccine |
3 | Pediatrics |
3 | Patient Readmission |
3 | Paramyxoviridae Infections |
3 | Pain |
3 | Oxygen Inhalation Therapy |
3 | Nursing Homes |
3 | Netherlands |
3 | National Health Programs |
3 | Mycoplasma pneumoniae |
3 | Morbidity |
3 | Models, Biological |
3 | Military Personnel |
3 | Mice |
3 | Mice, Inbred BALB C |
3 | Mexico |
3 | Meteorological Concepts |
3 | Meningococcal Infections |
3 | Medical Staff, Hospital |
3 | Mass Screening |
3 | Lung Diseases, Obstructive |
3 | Legionella pneumophila |
3 | Influenza Pandemic, 1918-1919 |
3 | Influenza A Virus, H1N2 Subtype |
3 | Immunologic Deficiency Syndromes |
3 | Immunity, Herd |
3 | Hygiene |
3 | Hospitals, Urban |
3 | Home Care Services |
3 | Hepatitis B Vaccines |
3 | Hemagglutination Tests |
3 | Heart Diseases |
3 | Health Education |
3 | HIV-1 |
3 | Genome, Viral |
3 | Genes, Viral |
3 | Fluorescent Antibody Technique |
3 | Enterovirus Infections |
3 | Efficiency, Organizational |
3 | Ecosystem |
3 | Early Diagnosis |
3 | Drug-Related Side Effects and Adverse Reactions |
3 | Dogs |
3 | Disease |
3 | Disease Transmission, Infectious |
3 | Disease Susceptibility |
3 | Diagnosis, Differential |
3 | Developed Countries |
3 | Demography |
3 | Complement Fixation Tests |
3 | Community Health Centers |
3 | Communicable Diseases, Emerging |
3 | Common Cold |
3 | Cold Temperature |
3 | Circoviridae Infections |
3 | China |
3 | Cells, Cultured |
3 | Cell Line |
3 | Capsid Proteins |
3 | CD4 Lymphocyte Count |
3 | Body Mass Index |
3 | Bacteria |
3 | Argentina |
3 | Antigenic Variation |
3 | Anti-HIV Agents |
3 | Anseriformes |
3 | Animal Migration |
3 | Animal Husbandry |
3 | Adverse Drug Reaction Reporting Systems |
3 | Adenoviridae |
2 | Wetlands |
2 | Water Microbiology |
2 | Vulnerable Populations |
2 | Virus Shedding |
2 | Virus Cultivation |
2 | Viral Matrix Proteins |
2 | Viral Envelope Proteins |
2 | Viral Core Proteins |
2 | Vasoconstrictor Agents |
2 | Vaccines, Subunit |
2 | Vaccines, DNA |
2 | Vaccines, Conjugate |
2 | Vaccination Refusal |
2 | Urine |
2 | Uncertainty |
2 | Turkey |
2 | Tuberculosis |
2 | Tissue Donors |
2 | Symptom Assessment |
2 | Switzerland |
2 | Streptococcal Infections |
2 | Statistics as Topic |
2 | Specimen Handling |
2 | Specialization |
2 | Spatio-Temporal Analysis |
2 | Smoking Prevention |
2 | Smoke |
2 | Smallpox |
2 | Sequence Homology |
2 | Search Engine |
2 | Respirovirus |
2 | Respiration Disorders |
2 | Residence Characteristics |
2 | Renal Replacement Therapy |
2 | Records |
2 | Radiography |
2 | Quality-Adjusted Life Years |
2 | Publishing |
2 | Public Health Administration |
2 | Propensity Score |
2 | Program Development |
2 | Prescription Drugs |
2 | Postoperative Complications |
2 | Positive-Pressure Respiration |
2 | Population Density |
2 | Population Characteristics |
2 | Polymorphism, Restriction Fragment Length |
2 | Point Mutation |
2 | Picornaviridae Infections |
2 | Physicians |
2 | Physicians, Primary Care |
2 | Pharyngitis |
2 | Pharmacists |
2 | Periodicals as Topic |
2 | Patient Education as Topic |
2 | Ozone |
2 | Otitis |
2 | Organ Transplantation |
2 | Nose |
2 | Norway |
2 | Nonprescription Drugs |
2 | Nervous System Diseases |
2 | Neoplasms |
2 | Myocarditis |
2 | Myocardial Infarction |
2 | Multiple Organ Failure |
2 | Mortality, Premature |
2 | Molecular Diagnostic Techniques |
2 | Military Medicine |
2 | Midwifery |
2 | Microbial Sensitivity Tests |
2 | Medication Adherence |
2 | Measles-Mumps-Rubella Vaccine |
2 | Markov Chains |
2 | Mammography |
2 | Macrolides |
2 | Legionnaires' Disease |
2 | Latin America |
2 | Italy |
2 | Internship and Residency |
2 | Intensive Care Units, Pediatric |
2 | Intensive Care Units, Neonatal |
2 | Information Dissemination |
2 | Influenzavirus B |
2 | Influenza A Virus, H7N7 Subtype |
2 | Influenza A Virus, H3N8 Subtype |
2 | Infant Mortality |
2 | In Situ Hybridization |
2 | Immunosuppressive Agents |
2 | Immunohistochemistry |
2 | Immunoglobulins |
2 | Immunoenzyme Techniques |
2 | Hypertension |