Zombie Infection

Just like how any zombie apocalypse starts there was a flu that was spreading across New York City. The civilians were acting a little more stranger than usual. Everybody was feeling a little under the weather, so hundreds of people went to their local hospital. Almost every room in the ER was cram packed with surgeons and sick people. One of the surgeons went to go on a lunch break which was a stupid idea. The patient got lost in the hospital and soon later on went on a psychotic rampage. He was eating everybody up, throwing people across the room, and infecting them as well. After that, there were than 153 infected people running around the city and infecting more and more and more people. Sooner or later the whole state of New York was infected and all of our military special ops groups had to go in and stop them. 

Picture from here