Virus replication and Mexican swine flu..H1N1 influenza A (flu) virus
Mexican swine flu has a complex ancestry containing parts from two previous swine flu viruses and gene segments that originated in birds or humans. The strain of the virus derives its name from the proteins found on the surface of the envelope in this case haemagglutinin (H) and neuraminidase (N. These proteins determine the type of host cell the virus will latch on to.
For NCEA level 1 science you need to be familiar with the process of virus replication.