A novel influenza A (H1N1) virus had emerged in 2009 and spread worldwide. The epidemic of 2009 A (

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A novel influenza A (H1N1) virus had emerged in 2009 and spread worldwide. The epidemic of 2009 A (H1N1) led to the first World Health Organization (WHO)-declared pandemic in more than 40 years.

The new A (H1N1) virus was genetically and antigenically distinct from previously circulating H1N1 viruses. The Centers for Disease Control and Prevention (CDC) estimates that between 43 million to 89 million cases of 2009 A (H1N1) influenza cases occurred in the United States between April 2009 and April 2010, with approximately 8,870 to 18,300 deaths (Available at: http://www.cdc.gov/h1n1flu/pdf/graph_April%202010N.pdf). 

a.​Is the emergence of the 2009 A (H1N1) virus an example of antigenic shift or antigenic drift?

b.​What is the difference between antigenic shift or antigenic drift?

c.​Why was the 2009 A (H1N1) influenza epidemic considered a pandemic?

SCIENCE
HEALTH SCIENCE
NURSING
NURS 4200

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