According to research the new strains of H1N1 virus are more dangerous than the earlier existing str...........

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According to research, the new strains of H1N1 virus are more dangerous than the earlier existing strains.

Which of the following is/are identified as the major reason/s for H1N1 Virus?

Development in genetic engineering

Antigenic drift multiple small mutations

Direct impact of climate change and global warming

All of the above

2nd statement is correct i.e. Antigenic drift multiple small mutations is identified as the major reason for H1N1 Virus.

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