- - - *Use a plague-infected unit to spread the plague* - - - Either one receives the plague directly from a source, such as a plague bomb or plague artillery - such is the case when you would attempt to perform a [[Plague Activation Indirectly]], or the unit gets infected by a city or unit that has the plague. By placing an infected unit within range of an enemy city, possibly a unit with high camo so you avoid political backlash in multiplayer, you can avoid directly engaging the enemy to infect his or her cities/units. To maximize the amount of damage you can do, target large clusters of cities so that the likelihood of a succesful infection is higher. Be advised that as long as the enemy has at least one plagued city or unit, they can use the same tactic against you. Plan accordingly so that the enemy cannot send their infected units to -your- important worlds.