Even though the infection by the typical strain of a nuclear-polyhedrosis virus is much more acute than that of the hypertrophic strain, the cytopathology, especially of the trachea, is similar. There is a difference, however, in the stratification of the hypodermis when infected by the typical strain. The sequence of autoradiographic changes, as demonstrated with
3H-thymidine,
3H-uridine, and
3H-tyrosine, for DNA, RNA and protein syntheses is the same for the infections caused by the two virus strains, and it resembles that of other nuclear polyhedroses.
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