Can viruses cut across VLANs?

I have one VLAN with email-enabled workstations and one VLAN with non-email workstation running on the same physical network. The VLANs can't see each other. So can a virus still cross over VLANs? Thanks in advance

hi
a virus can spread itself to other computers using a network communication, such as a tcp session between two computers, in your case the VLANs can t see each other it s okay but it still can communicate with each other using a layer 3 device if configured to do so.
so if two computers from two differents vlan in your network communicate with each other using a L3 device so there is a communication and the virus can cross from one computer in vlan x to another computer in vlan y, if the virus is designed to do so.
HTH
do rate if it does help

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