The discovery of vibrio bacteria in shellfish has prompted the closure for the rest of the summer of three commercial growing areas, including one in Dabob Bay, the state Department of Health said Thursday. The closure in Dabob Bay affects 14 commercial companies, said Richard Lillie, public health adviser in the shellfish and water safety office of the state Health Department. The two other areas closed are North Bay, between Allyn and Victor on the Hood Canal, and Totten Inlet near Olympia.