The Glast Gambit Update for Warframe introduced a new Gamemode, Infested Savage.
It’s similar to Interception but with 3 objectives and an integrity bar, there is an overall progression bar for the overall objective. The more points you have captured or “purified” the faster the progression bar goes.
Killing enemies drop Antiserum and Antiserum Injector Fragments, each point requires at least 2 Antiserum to activate the objective and a maintain a hold of 3 Antiserums. Antiserum Injector Fragments are components, probably going to used for crafting Antiserum later. Each Antiserum lasts roughly 20 seconds.
If you manage to maintain each point to have 2-3 Antiserum at a time, the progression bar will go the fastest. The objectives have an integrity %, if it drops to 0 it will die and you cannot activate that objective anymore. As long as you still have one objective still alive, you won’t fail but the progression bar will be the slowest.
The Infested Savage is currently the only way to obtain Nidus blueprints.