No, because virtual particles are a part of the physical vacuum and not real matter and energy. They do, however, contribute to the energy state of the vacuum and the magnitude of the so-called cosmological constant. Theoretical physicists have trouble understanding from their prototypes of the Theory of Everything, why virtual particles do not cause the gravitational field of empty space to be 10^120 times stronger than it seems to be in reality. They think that some 'mechanism' is responsible for canceling this huge excess in vacuum energy to 1 part in 10^120. But aside from hypothetical quantum wormholes, no one has a verifiable physical mechanism to offer.