The 2009 pandemic was caused by a new strain of the virus, combining genes from pigs, birds, and humans. With little existing immunity, it spread quickly, infecting millions and causing thousands of deaths worldwide
The 2009 pandemic was caused by a new strain of the virus, combining genes from pigs, birds, and humans. With little existing immunity, it spread quickly, infecting millions and causing thousands of deaths worldwide Health Sci-Tech News | Latest Technological Developments | The Hindu
