Plain vaccine : Usable up to a 75% infection rate, bring it back to 15%. Has a 95% risk of infection on a healthy subject. No preventive effect. No healing chance.
Quality vaccine : Usable up to a 86% infection rate, bring it back to 10%. Has a 20% risk of infection on a healthy subject. Preventive effect of 20% for 6 days. Healing chance of 1%.
Advanced vaccine : Usable up to a 96% infection rate, bring it back to 5%. Has a 2% risk of infection on a healthy subject. Preventive effect of 65% for 2 weeks. Healing chance of 2%.
Cure : Usable up to a 76% infection rate, no risk on a healthy subject. No preventive effect. Healing chance of 95%.

This is meant to make vaccines interesting again, as players tend to only use the cure.