According to a researcher, Nitesh Pandey of Indian Astrobiology Research Foundation (IARF), H1N1 influenza spreads rapidly because it of it's presymptomatic nature.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/news/h1n1-spreads-fast-because-its-presymptomatic-nature-research
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-news-analysis-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gujarat
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/swine-flu
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/influenza
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/infectious-diseases
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ahmedabad-d
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
