The Virus Expansion expands upon the base game for Cytosis. The expansion add Influenza, Rhino Virus and Ebola. Player may pay ATP to build up their antibodies to each of the three viral strains. When a Virus attacks, all player will roll a number of antibody dice according to their level of health and add it to the antibodies they've accumulated throughout the game. The player with the higest antibody response will gain resources while the player with weakest antibody response will lose resources. This Virus Expansion adds to the worker placement game Cytosis: A Cell Biology Game and tests players' resilience by exposing them to Ebola, Influenza, and Rhinovirus strain outbreaks Players must choose between spending valuable ATP to gain health points or increasing their antibodies to immunize themselves against inevitable infections. Some viruses break out regularly; others can only be activated by players. Neglect your antibodies, and you risk succumbing to a virus. Neglect your health, and an opponent wins.