Nemesis · Board game rules
If I scan two contamination cards, am I dead?
</think>Quick answer
No. You only die if you already have a Larva and scan a card revealing you are INFECTED. Scanning multiple cards does not kill you.
Details
Scanning reveals if a card is INFECTED. If you are not already Infected, you place a Larva on your board. [p.20 — Scanning and Removing Contamination Cards]
You only die if you already have a Larva on your Character board and scan a card that reveals you are INFECTED. [p.20 — Scanning and Removing Contamination Cards]
Watch out: Scanning multiple cards checks the group; you die only if you already have a Larva and at least one card is Infected. [p.25 — CANTEN]