One of the Last Sane ones

The virus has evolved, becoming a dangerous sickness changing the lives of everyone.
Keith, Mike, and the cheif are the last police officers in the city. Deserted and in ruins because of the virus which has yet no cure. Trying to keep this city in a minimum of order the infected have started to become more and more dangerous multiplying in 10000 by day.
Scientists are trying to find a cure and officers to keep it safe, how much longer can they fight a virus they have no clue on how it is caught?

Please know I do not own shiro and keith but the rest of the characters and story is mine