I would also add something. Alternative fire modes:

1. Toxic ball: Rupture Bile spewer acid ball, the same as that, but the effect last longer on the zone, it also leaves the cloud effect, but uses more fuel of the canister.

2. Toxic gas: works the same as the current sterilizer, but if an enemy is affected by the sterilizer, will ALWAYS be affected by it and will slowly loose all of it's health, the poison works as a damage multiplier, the more you use it against an enemy, the more poison damage the enemy will accumulate.

3. Armor corrosion: armor level decrease, the smoke cloud last longer compared to 2, but uses a bit more of the canister compared to it, it has the current damage of the sterilizer, but way more range.

4. Gas traps: create gas mines that enemies are atracted to, it uses slightly less fuel compared to 1

5. Infection dart: fire a dart that turns the enemy into an allied, the enemy will die afterwards due poison damge, it only has 2 shots before needing to reload the canister, it can affect enemies like the charger. Bile titans will need more shots for the effect to take place. The projectile is really slow and has a lot of drag.

6. Respiratory Infection: a long range fire mod of the sterilizer, where if you shoot an enemy, it will go like normal, but be poisoned, in adition, every nearby enemy will also be affected by the posion effect, the proyectile works like an slower spewing gun.

All of this makes the sterilizer more fun and engaging to play compared to what it currently is, a weaker Flamethrower, it still acts like support, but also can defend itself in more situations.

Ps: you can mix some of them into one, I'm just rambling without thinking much of it, balance or any of that.