[SR5]Question: Does a Strain I Infected need to roll an Essence Drain Addiction Test for each drained point or once per victim/drain session?

Read the Infection power in the core book.

When a critter with this power uses Essence Drain to reduce the victim’s Essence to 0, this power attempts to pass the critter’s own infection on to the victim.

Read HMHVV Strain I in Run Faster.

Vector: Infection power (p. 398, SR5)

This strain is responsible for creating banshees, dzoo-noo-qua, goblins, mutaqua, nosferatu, vampires, and wendigos. It’s only spread by the Infection power.

You can only be infected with Strain I or Ia by being Essence Drained to zero Essence. Otherwise you can not be Infected. Without being completely drained, you can only be a Strain I or Ia Carrier, aka have the Carrier negative quality, RF 141.

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