On 27 April, 6 days after the U.S. Centers for Disease Control and Prevention (CDC) first reported an unusual swine flu outbreak in humans, international agencies were still struggling to determine how serious a threat the virus posed.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/swine-flu-circles-globe-scientists-grapple-basic-questions
[2] http://admin.indiaenvironmentportal.org.in/category/author/martin-enserink
[3] http://admin.indiaenvironmentportal.org.in/category/author/jon-cohen
[4] http://admin.indiaenvironmentportal.org.in/category/journal/science
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/medical-research
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drugs
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/infectious-diseases
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/viral-diseases
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/influenza
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mexico
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/swine-flu