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Number of Virus Particles in Insects and Plants Infected with Wound Tumor Virus

Boyce Thompson Institute for Plant Research, Yonkers, New York 10701
Federal Research Institute for Animal Virus Diseases, Tuebingen, Germany

ABSTRACT

A new procedure for counting virus particles was employed to measure the concentration of wound tumor virus in purified virus preparations, in plant tumors, and in the insect vector. Partially purified wound tumor virus was used to establish the quantitative features of the method. A 1-g amount of plant tumor tissue contained an average of 5 x 10¹⁰ virus particles and 1 g of insect tissue contained 2 x 10¹⁰ particles.