Indian swine flu strain more virulent due to mutations, says MIT study

The authors of the MIT study — both Indian origin scientists — have said these viruses contain amino acid changes which can be linked to “enhanced virulence and are potentially antigenically distinct from the current vaccine containing 2009 (Cal0709) H1N1” strain.

However Indian scientists have countered and said that the mutations are minor and the report is alarmist

http://indianexpress.com/article/india/india-others/swine-flu-may-mutate-to-be-more-dangerous-in-india-mit-study/