Patient Zero by Jonathan Maberry

“When you have to kill the same terrorist twice in one week, there’s either something wrong with the world or something wrong with your skills… and there’s nothing wrong with Joe Ledger’s skills. Ledger, a Baltimore detective assigned to counterterrorism task force is recruited by the government to lead a new ultra secret rapid-response group called the Department of Military Science (DMS) to help stop a group of terrorists from releasing a bioweapon that can turn ordinary people into zombies”