Summary
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1.
Parainfluenza 1 virus (both Sendai virus and haemadsorption virus 2) and parainfluenza 2 (croup-associated) virus have been examined in the electron microscope.
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2.
Particle size varies from 1500 to 6000 Å (greatest diameter) and the outline is approximately circular. The particles contain an inner component 170 to 180 Å diameter, showing helical symmetry.
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3.
The particles of these viruses are essentially similar to those of parainfluenza 3 and Newcastle disease virus, and also to those of measles and rinderpest.
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Waterson, A.P., Hurrell, J.M.W. The fine structure of the parainfluenza viruses. Archiv f Virusforschung 12, 138–142 (1963). https://doi.org/10.1007/BF01258760
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DOI: https://doi.org/10.1007/BF01258760