Plays a role in bridging the mature virion with structural protein A25. Presence of protein A26 in the virion structurally prevents direct virus-cell fusion mechanism. Interacts with proteins A17, A25 and A27. Interacts with host laminin (By similarity). A26 is anchored to the mature virion (MV) membrane through disulfide bonding with protein A27. Belongs to the chordopoxvirinae A26 protein family.