The U.S. Facilities for Illness Management and Prevention has
printed new particulars about swine flu instances within the United
States. The Morbidity and Mortality Weekly Report
helps earlier proof that the virus spreads from human to
human, including six instances to the 2 found earlier. The six
instances had been revealed at a press convention on Friday, 24 April,
however the MMWR presents extra specifics about every case.
Source : http://www.sciencemag.org/news/2009/04/new-details-emerge-swine-flu