Contagion fires on status applied. On a piece that carries it it reads: Applying a status has a {chance}% chance to spread it to the nearest other enemy for {value}% of the hit.

Word for word it is Applying a status has a {chance}% chance to spread it to the nearest other enemy for {value}% of the hit, and the number in it grows with the gear: 50 to start, 3 more for every item level, at a 20% chance.

0 bases carry it.