Virus is a microscopic organism that lives in a cell of another living thing. Although viruses are extremely small and simple, they are a major cause of disease. Some viruses infect human beings with such diseases as measles, influenza, and the common cold.
Passive Mobs. Passive mobs are composed of creatures that will never, under any circumstances, attack the player. Some passive mobs can be bred to create more of them, e.g. pigs can be bred to effectively farm them.
1 Out of all mobs in the game, there are only three water mobs: the squid, the Guardian, and the Elder Guardian. 2  Mobs can be spawned using spawn eggs, except for Iron Golems, Snow Golems and Withers, which are spawned by the player building them in-game from specific blocks.