Hyderabad: With swine flu (H1N1) claiming over 800 lives in India this year, a world-renowned scientist in viral pathogenesis has called for the need to sequencing the circulating strains in the country to find out if the virus is mutated.

Voicing concern over high mortality rate, Rafi Ahmed, director, Emory Vaccine Center in US' Atlanta, has also called for screening the samples for H3N2 and influenza type B besides H1N1 virus.