Vietnam's most recent spate of human bird flu cases suggests the leathal avian influenza virus has mutated in ways that make it increasingly infectious to people, raising the risks of person-
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/who-warns-mutation-bird-flu-virus-increases-risk-pandemic
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-wall-street-journal-hong-kong
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health