As of 0.17.7.1, you now collide with other players, TNT, and ragdoll corpses in Virus.
Might be related to the bug where you can no longer walk through items with disabled collision in workshop maps.
Notes / Media
All of the example videos were recorded on workshop maps but this happens in official maps too.
Crouch-walking into some TNT, which causes it to fly forward with impressive speed (this could make for a fun game type or mutator):
Colliding with other players: