Avian influenza virus, TEM C016 / 2352
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Avian influenza virus, TEM C016 / 2352
Avian influenza virus, type A strain H7N9, coloured transmission electron micrograph (TEM). This virus first emerged in the human population in China, in March 2013. The virus consists of ribonucleic acid (RNA), surrounded by a nucleocapsid and a lipid envelope (yellow). In the envelope are two types of protein spike, haemagglutinin (H) and neuraminidase (N), which determine the strain of virus. The natural hosts of this virus are wild birds. Unusually, infected domestic chickens do not show symptoms, which increases the potential for spread to humans that have contact with chickens. Nearly a third of human infections are proving to be fatal. As of May 2013 no human to human transmission has been recorded
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 9202257
© CDC/SCIENCE PHOTO LIBRARY
2013 Antigen Avian Bird Bird Flu Capsid China Envelope Enveloped Haemagglutinin Hemagglutinin Influenza A H7n9 Lipid Microbiology Microscope Negatively Stained Neuraminidase Nucleocapsid Orthomyxoviridae Orthomyxovirus Particle Pathogenic Pathological Pathology Polymorphic Ribonucleic Acid Rna Virus Segmented Genome Serotype Strain Transmission Electron Transmission Electron Micrograph Type A Viral Virion Virological Virology Microbiological Pathogen Protein Virus
EDITORS COMMENTS
This print showcases the Avian influenza virus, type A strain H7N9, as captured through a coloured transmission electron micrograph (TEM). Originating in China in March 2013, this virus has emerged as a significant threat to both avian and human populations. The image reveals the intricate structure of the virus, composed of ribonucleic acid (RNA) surrounded by a nucleocapsid and a lipid envelope that appears in vibrant yellow. What sets this particular strain apart are the two protein spikes embedded within the envelope - haemagglutinin (H) and neuraminidase (N). These spikes determine the specific strain of the virus. While wild birds serve as its natural hosts, it is alarming that infected domestic chickens do not display any symptoms. This lack of visible signs increases the risk for human transmission when individuals come into contact with these seemingly healthy birds. Tragically, nearly one-third of human infections have proven fatal since its emergence. As of May 2013, no instances of human-to-human transmission have been recorded. However, scientists continue to closely monitor this situation due to its potential for rapid spread. The photograph provides an up-close look at this pathogenic agent responsible for bird flu outbreaks across Asia. It serves as a reminder of our ongoing battle against infectious diseases in the 21st century and highlights how crucial advancements in virology and medicine are for combating such threats effectively.
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