I watched this movie once. It had to be like as late as 2008. It started with this guy and his wife going on vacation and his job calls. The wife tells him not to answer, they can wait because it's time for vacation. The tire on their car blows out next to an corn field and the guy is left changing the tire while his wife ventures into the field. The wife ends up getting bit and tries to kill the husband when he gets her into the car. He leaves to find help and happens upon a sheriff who is searching for his teen/adult daughter and zombies attack the car and the sheriff dies. The guy runs off and happens upon an abandoned looking house but there are people inside. They later go on to figure out that experiments have started in the basement and the people inside struggle to get everything they need to escape while zombies make their way in the house. Only two people survive, after military help comes but they crash the helicopter. The survivors are the husband and the sheriff's daughter. Please help!

The Killing Strain (2010)