When looking across the Internet and at news sources for a swine flu update, the source of the material matters. Some sites do not have information backed up by official agencies. The news from these must be taken with some skepticism until a verification of their facts can be made. Reputable sites are those from trusted health agencies staffed by physicians. These include the Centers for Disease Control (CDC) and the World Health Organization (WHO). Both of these have sites devoted exclusively to swine flu updates and H1N1 flu pandemic.