With swine flu now widespread in the United States, the World Health Organization reported Monday that the disease had widened globally, too, with 20 countries reporting 985 laboratory confirmed cases, compared with 18 countries reporting 898 confirmed cases on Sunday. Colombia and El Salvador were the latest countries to join the W.H.O. list, headed by Mexico, with 590 laboratory confirmed cases, and the United States with 226. France reported two more cases on Monday