Quarantine (2008)

Television reporter Angela Vidal and her cameraman are assigned to spend the night shift with a Los Angeles Fire Station. After a routine 911 call takes them to a small apartment building, they find police officers already on the scene in response to blood curdling screams coming from one of the apartment units. They soon learn that a woman living in the building has been infected by something unknown. After a few of the residents are viciously attacked, they try to escape with the news crew in tow, only to find that the CDC has quarantined the building.