Influenza virus, TEM

Credit: A. DOWSETT, PUBLIC HEALTH ENGLAND/SCIENCE PHOTO LIBRARY

Caption: Influenza viruses. Coloured transmission electron micrograph (TEM) of a section through influenza (flu) virus particles. Influenza belongs to the orthomyxovirus group of viruses. It contains a core of RNA (ribonucleic acid) genetic material inside a protein coat (capsid, pink). Antigenic spikes (green) on the capsid allow the virus to attach to its host cell. Influenza is an infection of the respiratory tract. It causes fever, aching muscles, a sore throat and weakness. New strains of the virus develop rapidly, and can cause epidemics. Magnification: x105,000 at 6x7cm size.

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