The cards and tokens of the Pathogenesis: Update Pack replace the matching cards and tokens from version 1.0 of Pathogenesis.
The new tokens have their own attack value if they are present on a pathogen at the beginning of a turn. During the immune system’s attack phase, if the tokens were played on a previous turn add their attack value to the attack value of any immune systems cards played on the pathogen this turn.
16 Immune system cards (4 copies each of: Regulatory T-Cell, Plasma Cell, Memory B Cell, and Immunoglobulin Class A Antibody Neutralization
20 Tokens (5 copies each of: IgG, IgM, C3, and IgE)