*Spike proteins include '''HN''' (Haemagglutinin and Neuraminidase) and '''F''' (Fusion glycoprotein), which allows the virus to fuse directly to the plasma membrane and release its RNA
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**F also causes syncitium to form, which aids diagnosis
=Virulence=
=Virulence=
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*Paramyxoviruses replicate in the epithelium of the upper respiratory tract as well as occasionally in the gut