Meaning you could break it in from fungal spores or from infected person

Is the fungus responsible for nazaribustiosis (spores)

First symptom: unable to feel pain

Symptoms: blood regurgitation, abdominal swelling, high fevers

Dendrobates tinctorius venom

But it must be taken during the incubation period to be affective.

Since it is a deadly poison, if the disease is not present/or if OD death is inevatible