Cabin Fever: Patient Zero (2014) online

A group of friends think they're going to the perfect spot for a bachelor party; a secluded private island. They quickly learn the island is not as private as they thought. The island is home to a lab thought to be empty, but in actuality a deadly, extremely fast acting, flesh eating virus has just escaped containment. Now everyone on the island has to fight not only to survive the outbreak, but also to survive each other.