For The Resident Evil CODE: Veronica item, see Serum (Code: Veronica). For The Resident Evil 7: Biohazard item, see Serum (RE7).
"There's just enough for one dose."
A serum is mostly an antidote to a poison, although its effect and purpose can vary depending on the game.
- If Jill was poisoned but did not sustain significant damage, she must collect the serum herself.
- If Jill was poisoned and sustained damage, she will fall unconscious and Barry will collect it for her. She will regain consciousness in the 1F chemical storage room.
- If Chris is poisoned, he will lose consciousness and the player will take control of Rebecca, who must collect the serum for him.
- In the original version, if Chris decides not to take Rebecca with him after meeting her in the chemical room, she will automatically take him back there and administer the serum.