Berserker plague

A pathogen that creates revenants-intelligent zombies. Tested by the UK as a bioweapon, presumably to make the subject immune to bullets. The infected-"Berserkers"-can stay alive for at least ten years without food, water, or oxygen. Some may manifest psionic tendencies. It has some supernatural attributes, such as a sensitivity to silver. Transmitted by bite. This is in the book Berserker by Tim Lebbon