madin-darby canine kidney ( mdck ) cells can sustain double infection with pairs of viruses of opposite budding polarity ( simian virus 5 [ sv5 ] and vesicular stomatitis virus [ vsv ] or influenza and vsv ) , and we observed that in such cells the envelope glycoproteins of the two viruses are synthesized simultaneously and assembled into virions at their characteristic sites .
C0042769
infection
C0021400
influenza