- GnadeMasta
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- Honorable Legendary Member
Infection forms are needed to infect a host until the Flood Overmind has enough information on a species to infect it with any of its (super)cells.
It's simply my guess.
My guess is that the White Blood cells in a human's body will destroy the flood cells, unless they get the "weak spot" of the white blood cells, or are turned off by the infection form.