WowHead
FatBoss
Icy Veins
TL;DR -
4.1. Tanks
- Taunt swap when one tank has dropped their stacks of Evolving Affliction.
 - Make sure to avoid receiving Omega Vector from your other raiders.
 
4.2. Healers
- Keep an eye on players with high stacks of Lingering Infection.
 - Be mindful of who Omega Vector is on, and be ready to dump heals into them if they are targeted by Gestate.
 - In phase two, give special attention to players soaking Plague Bomb.
 
4.3. DPS
- Focus down Plague Amalgams as fast as possible to prevent additional casts of Immunosuppression.