H1N1 influenza, also known as "novel H1N1 virus" has led to a "global outcry." This virus is more virulent when compared with other seasonal flu viruses. Virulence may change as the adaptive mutation gene increases within the virus. A study at the US Centre for Disease Control and Prevention published in May 2009 found that children had no preexisting immunity to the new strain as they showed no cross-reactive antibody reaction when compared with adults aged 18-64 years, who showed a cross-reactive antibody reaction of 6-9% and older adults with 33% immunity. This review article depicts H1N1 virus, its virulence with genetic evolution potential and preventive protocol for the dental professionals. This would allow us to comprehend the changes in the disease process and contribute in its prevention as "prevention is better than cure."
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