Wikipedia entity: List of dangerous snakes
Topics: medical statistics; venomous species; mortality rate
Original sentence: Envenomation rate among this species is very high and the untreated mortality is 70%, although even with antivenom and mechanical ventilation the mortality rate is at 50%.
Quantified sentence: Envenomation rate among this species is very high and the untreated mortality rate is large, although even with antivenom and mechanical ventilation the mortality rate is at 50%.
Quantifier: large
Percentage: 70%
Specificity: partially