virtual humans
virtual laboratory
virtual learning environment
virtual machine
virtual objects
virtual organizations

virtual patients
virtual reality
virtual reality environments
virtual reality simulation
virtual reality simulators
virtual reality technology
virtual screening

virtual spaces
virtual teams
virtual universities
virtual work
virtual worlds
virtue
virtue ethics

virtuous circle
virulence
virulence activity
virulence determinants
virulence factor CagA
virulence factor production
virulence factors

virulence gene expression
virulence genes