RFG

Background
RFG (Rapid Fungal Growth) is a pathogene found on the island of St. Germain in Season 2 of Helix.

Anatomy
Rapid Fungal Growth affects both normal humans and Immortals, making it presumably the first known pathogen to do so (30 years in the future). It causes splothces on the skin that look like boils. A bright yellow fungus grows in the throat, causing the victim to suffocate. Victims become very violent and bite, claw, and attack any uninfected people that are nearby, especially loved ones. RFG typically kills its victims within 72 hours of infection.

Quotes
"It's like ergot poisoning. A fungal toxin that produces psychosis along with severe physical symptoms." - Sarah Jordan, Scion