Pod infector/Gameplay

Overview
The Flood Infection form is one of the easiest creature to eliminate in the Halo series, requiring only one shot form any weapon. However, as easy as it may seem, a swarm of Infection forms can also be a formidable threat to the unwary individual.

Halo: Combat Evolved

 * It is best to leave the Infection forms for last and focus on larger threat such as the Combat forms and the Carrier forms.
 * Shooting a swarm of Infection forms can set off a chain reaction killing a couple of nearby Infection forms within that swarm. For example, in a swarm of three Infection forms, killing one could incidentally kill off the other two if they're close to one another.
 * An Assault Rifle is the best tool to kill of a swarm, followed by the Plasma Pistol and the Needler (to kill one at a distance). Reserve the rest of the weapons for the Combat forms.
 * The Assault Rifle is the best gun. Additional ammunition is plentiful in the Flood campaign levels. Make full use of it.
 * The Needler is fun to use on the Infection forms from a distance. The homing needles makes it easier for the player to not aim properly and escape at ease.
 * If all else fails, melee the Infection forms.

Halo 2

 * Unlike in Halo: Combat Evolved above, there is no "chain reaction" effect when shooting a swarm of Infection forms. As such, the player must use considerable effort to kill the swarm. A SMG would generally be sufficient for such job.
 * Similarly to the above section, it is harder (and potentially impossible) to melee the Infection forms. As such, engage them at a distance.

Halo 3

 * Much of the gameplay tips in Halo 2 section above can be used in Halo 3.
 * The SMG and the Assault Rifle are the best tool to kill of the Infection forms due to their ammunition count.