CDC / SCIENCE PHOTO LIBRARY CDC / SCIENCE PHOTO LIBRARY
Measles virus. Coloured transmission electron micrograph (TEM) of a measles virus (rubeola). The envelope of the virus has broken, exposing the nucleocapsid filaments. Nucleocapsids are protein- nucleic acid complexes which are normally coiled up into a ball. They contain the genetic material of the virus. Smaller simian viruses (SV40, blue circles) are also seen, at upper right for example. These are polyoma viruses. Measles viruses are morbilliviruses, a type of paramyxovirus. Measles is highly infectious and mainly affects children, producing fever and a rash. One attack usually provides lifelong immunity. Magnification unknown.
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