When a laboratory technician on the verge of retirement accidentally infects himself with blood from an emergency room patient, he intends to report it--until government agents swarm the hospital, confiscating every sample of blood taken from the patient--at gunpoint. Deciding not to report the incident just yet for fear of being thrown into an isolation chamber, he goes home--and falls violently ill. By the time he recovers and returns to work, scary things are happening.