When it hits
From day 18 on the Student's run
No warning comes first.
Starts with Rat Infestation, ends with 
Rodent Problem Subsides.
The same on every run: Wage Slave, Warehouse Manager
What comes
No zombies: this crisis is about the weather, sickness or pests, not a siege.
From the game files2
Crisis 136
| id | 136 |
|---|---|
| CrisisID | 136 |
| StartEvent | [52643] |
| EndEvent | [52658,52659] |
| Des | Crisis_Des_136 |
| Des_Local | 鼠患 |
