Both processes, receptor binding and membrane fusion, are catalyzed by the glycoprotein G which plays a critical role in pathogenesis (mutant virus without G proteins cannot propagate).
Ambos os procesos, unión ao receptor e fusión de membranas, están catalizados pola glicoproteína G, que xoga un papel crítico na patoxénese (un virus mutante sen as proteínas G non pode propagarse).