Four protocols for presymptomatic testing for vCJD
| Universal testing | Selective testing | |
|---|---|---|
| Voluntary testing | Protocol 1: all persons who want to be tested can be tested | Protocol 2: all persons undergoing a medical procedure posing a potentially higher risk of transmission can be tested |
| Compulsory testing | Protocol 3: all persons must be tested | Protocol 4: all persons undergoing a medical procedure posing a potentially higher risk of transmission must be tested |