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Illustration of an influenza virus being attacked by antibodies. · SCIEPRO/SCIENCE PHOTO LIBRARY
Flu virus spreading, conceptual computer artwork. Virus particles (virions, spheres) around a human silhouette. · MEHAU KULYK/SCIENCE PHOTO LIBRARY
Flu pandemic, conceptual computer artwork. · ROBERT BROCKSMITH/SCIENCE PHOTO LIBRARY
Teddy bear wearing a face mask. · LEA PATERSON/SCIENCE PHOTO LIBRARY
Computer artwork of a generic virus particle, depicting virus types like SARS, MERS and corona. · ALFRED PASIEKA/SCIENCE PHOTO LIBRARY
Computer artwork of a generic virus particle, depicting virus types like corona, bird flu, aids, influenza, swine flu and herpes. · ALFRED PASIEKA/SCIENCE PHOTO LIBRARY
Businesswoman with headset blowing nose at computer in work. · CAIA IMAGE/SCIENCE PHOTO LIBRARY
Artwork of type-A influenza viruses (grey) attacking cells lining the trachea (windpipe). The cells have hair-like cilia which normally filter foreign particles from the air. · HYBRID MEDICAL ANIMATION/SCIENCE PHOTO LIBRARY
Elderly woman blowing her nose with a tissue. Rhinitis (inflammation of the nose membranes) during a viral infection, leads to increased production of nasal mucus. · CRISTINA PEDRAZZINI/SCIENCE PHOTO LIBRARY
Woman wearing a face mask to protect herself from MERS-CoV. · GARO/PHANIE/SCIENCE PHOTO LIBRARY
Common cold virus, conceptual illustration. The common cold is caused by different viruses including rhinoviruses, other enteroviruses, coronaviruses, influenza and parainfluenza viruses, and adenoviruses. · KATERYNA KON/SCIENCE PHOTO LIBRARY
Infection of a person by respiratory viruses, illustration. Conceptual image. · KATERYNA KON/SCIENCE PHOTO LIBRARY
Nasal bacterial culture. Coloured scanning electron micrograph (SEM) of a culture of bacteria from a nasal passage. · STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of H1N1 influenza (flu) virus particles budding from a lung cell. H1N1 is a subtype of the influenza A virus. · SCIENCE PHOTO LIBRARY
H3N2 influenza virus particles, coloured transmission electron micrograph (TEM). Each virus consists of a nucleocapsid (protein coat) that surrounds a core of RNA (ribonucleic acid) genetic material. · CDC/SCIENCE PHOTO LIBRARY
Robotic hand holding a virus, computer illustration. · KTSDESIGN/SCIENCE PHOTO LIBRARY
Conceptual visualization of the Swine Influenza Virus (H1N1). · SCIENCE PICTURE CO/SCIENCE PHOTO LIBRARY
Influenza viruses. Coloured transmission electron micrograph (TEM) of influenza (flu) viruses. · DR LINDA STANNARD, UCT/SCIENCE PHOTO LIBRARY
Influenza virus life cycle, illustration. The flu virus (Orthomyxovirus) carries RNA (ribonucleic acid) wrapped in proteins and a membrane. · JOSE ANTONIO PENAS/SCIENCE PHOTO LIBRARY
Virus research, conceptual illustration. · VENTRIS / SCIENCE PHOTO LIBRARY
Influenza (flu) virus entering a cell, artwork. Embedded in the virus particle's lipid envelope (green) are two types of protein spike, haemagglutinin (H) and neuraminidase (N). · HYBRID MEDICAL ANIMATION/SCIENCE PHOTO LIBRARY
Flu viruses. Conceptual image of influenza viruses (brown) in the airways of the lung. · KARSTEN SCHNEIDER/SCIENCE PHOTO LIBRARY
Scientist in protective suit with digital tablet. · IGOR STEVANOVIC / SCIENCE PHOTO LIBRARY
Pandemic virus. Computer artwork showing how a virus (green), such as the influenza (flu) virus, can spread through a population and cause a pandemic illness. · ANIMATED HEALTHCARE LTD/SCIENCE PHOTO LIBRARY
Pharmaceutical research, conceptual image. · TEK IMAGE/SCIENCE PHOTO LIBRARY
Flu pandemic, conceptual computer artwork. · ROBERT BROCKSMITH/SCIENCE PHOTO LIBRARY
Flu vaccine, conceptual computer artwork. · ROBERT BROCKSMITH/SCIENCE PHOTO LIBRARY
Influenza viruses. Coloured transmission electron micrograph (TEM) of influenza (flu) viruses (red) budding from a host cell (green). · STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Virus particles, computer artwork. · KTSDESIGN/SCIENCE PHOTO LIBRARY
Flu virus particle. See-through computer artwork of an influenza (flu) A virus particle (virion). · THOMAS FESTER/SCIENCE PHOTO LIBRARY
Virus particles, illustration. · JESPER KLAUSEN / SCIENCE PHOTO LIBRARY
H1N1 swine flu virus. Coloured transmission electron micrograph (TEM) of a section through swine influenza (flu) virus particles (virions, round). · SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph of a cell infected by influenza virus. The cell in this case is a tissue-culture cell (green & yellow); it has been programmed by the virus to produce more virions (red), which it is in the process of releasing. · DR GOPAL MURTI/SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph of a single influenza virus. This highly contagious virus is of the orthomyxovirus group. · NIBSC/SCIENCE PHOTO LIBRARY
Nasal bacterial culture. Coloured scanning electron micrograph (SEM) of a culture of bacteria from a nasal passage. · STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of virus particles from human cells infected with the classic influenza A virus A/Puerto Rico/8/34 (H1N1). This strain of influenza virus (here showing the filamentous form) is a descendent of the 1918 Spanish influenza virus, but is now highly laboratory adapted and is used as the basis for influenza virus vaccines because it replicates to very high titre in chicken eggs and in cell cultures. · STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Human cell infected with bird flu virus, coloured scanning electron micrograph (SEM). Influenza (flu) is an infectious disease caused by an influenza virus. · STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of a human cell infected with H3N2 flu virus. Influenza (flu) is an infectious disease caused by an influenza virus. · STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Influenza (flu) virus H3N2 strain. Illustration showing the structure of the virus particle. · RAMON ANDRADE 3DCIENCIA/SCIENCE PHOTO LIBRARY
Virus particle infecting a cell, illustration. Viruses consist of a genome (genetic material, yellow spirals) and sometimes a few enzymes stored in a capsule (called a capsid) made of protein, and sometimes covered with a lipid layer (an 'envelope'). · PRETTYMOLECULES/SCIENCE PHOTO LIBRARY
Herpes virus. Computer artwork of herpes virus particles (virions). · ANIMATED HEALTHCARE LTD/SCIENCE PHOTO LIBRARY
Virus particles in a vein, computer illustration. · MAURIZIO DE ANGELIS/SCIENCE PHOTO LIBRARY
Illustration of antibodies (pale pink) attacking influenza viruses. The antibodies bind to the hemagglutinin protein, which contains the antigenic site of the virus, and prevent it from binding to the surface of human cells. · JUAN GAERTNER/SCIENCE PHOTO LIBRARY
Viruses and bacteria, illustration (not to scale). · JESPER KLAUSEN / SCIENCE PHOTO LIBRARY
Virus particles, illustration. · JESPER KLAUSEN / SCIENCE PHOTO LIBRARY
Doctor holding cotton wool on young girl's arm after injection. · SCIENCE PHOTO LIBRARY
Pharmacist showing medicine to sick girl and woman in pharmacy. · SCIENCE PHOTO LIBRARY
Female doctor injecting young girl in arm. · SCIENCE PHOTO LIBRARY
Paediatric examination. Doctor using a tongue depressor to allow an examination of a young girl's throat. · ADAM GAULT/SCIENCE PHOTO LIBRARY
Boy with mouth open and tongue depressor. · SCIENCE PHOTO LIBRARY
Paediatric examination. Doctor listening to the chest sounds of a 5-month-old male patient using a stethoscope. · IAN HOOTON/SCIENCE PHOTO LIBRARY
Influenza virus structure, cutaway artwork. The core of the virus is its genetic material, ribbons of single-stranded RNA (ribonucleic acid). · ALFRED PASIEKA/SCIENCE PHOTO LIBRARY
Throat and paranasal sinuses. Coloured 3D computed tomography (CT) scan of the nasopharynx (upper airways of the throat) and of the paranasal sinuses. · K H FUNG/SCIENCE PHOTO LIBRARY
Woman covering her face with his arm to sneeze. · GARO/PHANIE/SCIENCE PHOTO LIBRARY
Human nasal cavity. Coloured 3D computed tomography (CT) scan of the nose (left), nasal cavity, nasopharynx and paranasal sinuses (red) of a human head. · K H FUNG/SCIENCE PHOTO LIBRARY
Woman covering her face with his arm to sneeze. · GARO/PHANIE/SCIENCE PHOTO LIBRARY
Normal facial bones and paranasal sinuses. Coloured 3D computed tomography (CT) scan of the normal human facial bones and paranasal sinuses, viewed from the side. · K H FUNG/SCIENCE PHOTO LIBRARY
Woman wearing a face mask. · GARO/PHANIE/SCIENCE PHOTO LIBRARY
Influenza A virus (RNA virus, Orthomyxoviridae Family), coloured transmission electron micrograph (TEM). Virus', often know as 'The Flu Virus' often changes or mutates, complicating the development of suitable vaccines for all strains. · DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY
Flu viruses, computer illustration. Each virus consists of a core of RNA (ribonucleic acid) genetic material surrounded by a protein coat (blue). · KATERYNA KON/SCIENCE PHOTO LIBRARY
Runny nose. Artwork of a section through the ear, nose and throat of a patient with excessive mucus production due to a cold or hay fever (allergic rhinitis). · JOHN BAVOSI/SCIENCE PHOTO LIBRARY
H1N1 1918 influenza virus particles (blue), coloured transmission electron micrograph (TEM). These virus particles (virions) have been recreated from the influenza (flu) virus strain that caused the 1918 Spanish flu pandemic. · CDC/SCIENCE PHOTO LIBRARY
Structure of the Reovirus core (PDB 1EJ6), which synthesizes, modifies and exports viral messenger RNA. Reovirus infection occurs frequently in humans, but most cases are mild. · SCIENCE PICTURE CO/SCIENCE PHOTO LIBRARY
Woman wearing a respiratory protective mask in subway. · VOISIN/PHANIE/SCIENCE PHOTO LIBRARY
Surgical mask. Healthcare professionals and emergency workers wear surgical masks to protect themselves from airborne infections. · KEVIN CURTIS/SCIENCE PHOTO LIBRARY
Injection. Doctor administering an injection in a patient's arm. · TEK IMAGE/SCIENCE PHOTO LIBRARY
Syringe and drug phial. · TEK IMAGE/SCIENCE PHOTO LIBRARY
Influenza vaccine injection. Injection into a patient's arm of the 2018/2019 seasonal influenza (flu) vaccine for the northern hemisphere season. · DR P. MARAZZI/SCIENCE PHOTO LIBRARY
Syringe being filled. Drug or vaccine being drawn into a hypodermic syringe. · TEK IMAGE/SCIENCE PHOTO LIBRARY
Influenza vaccination. Winter vaccination campaign injection of the vaccine for influenza A. This vaccine contains inactivated virions, or particles, of strains of the influenza (flu) virus. · FRED GUERDIN/REPORTERS/SCIENCE PHOTO LIBRARY
Nanoparticle flu vaccine prototype, illustration. This prototype for a universal flu vaccine consists of a nanoparticle that is a hybrid of a protein scaffold (blue) and eight influenza hemagglutinin proteins on the surface (yellow, one not visible). · National Institute of Allergy and Infectious Diseases, NATIONAL INSTITUTES OF HEALTH/SCIENCE PHOTO LIBRARY
Stylized view of alveolar sacs from within the respiratory system. · SCIENCE PICTURE CO/SCIENCE PHOTO LIBRARY
Computer artwork of a generic virus. · ALFRED PASIEKA/SCIENCE PHOTO LIBRARY
Flu viruses in the throat. Computer artwork of influenza (flu) viruses (ovals) in a human throat. · EQUINOX GRAPHICS/SCIENCE PHOTO LIBRARY
Scientist wearing protective clothing whilst viewing bacteria cultures growing in petri dishes in a laboratory. · TEK IMAGE/SCIENCE PHOTO LIBRARY
Virology laboratory, Limoges hospital, France. · BURGER/PHANIE/SCIENCE PHOTO LIBRARY
School infections,conceptual image. Image of a blackboard and a facemask, representing attempts to prevent the spread of illnesses such as flu amongst school children. · LEA PATERSON/SCIENCE PHOTO LIBRARY
Mother taking daughter's temperature in bed. · IAN HOOTON/SCIENCE PHOTO LIBRARY
Seven-year old girl in bed with the flu as her mother aids her, in Bothell, Washington. · JIM CORWIN/SCIENCE PHOTO LIBRARY
Woman wearing a respiratory protective mask. · GARO/PHANIE/SCIENCE PHOTO LIBRARY
Nasal influenza vaccine on a medical tray. · TEK IMAGE/SCIENCE PHOTO LIBRARY
A 73-year-old woman drinking hot lemon and wearing a scarf to keep warm. · LEA PATERSON/SCIENCE PHOTO LIBRARY
Medicinal plants, conceptual image. · SCIENCE PHOTO LIBRARY
Sage leaves. Coloured x-ray of leaves from the common sage plant (Salvia officinalis). · GUSTOIMAGES/SCIENCE PHOTO LIBRARY
