 
			 
			MCQOPTIONS
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				| 1. | Influenza virus undergoes antigenic shift resulting in major antigenic changes by which of the following mechanisms? | 
| A. | Somatic recombination of heavy and light chains | 
| B. | Expression of several different capsule types | 
| C. | Changing the receptor binding canyon that docks with the host receptor | 
| D. | Reassortment of RNA segments from different influenza viruses | 
| Answer» E. | |