31. The search for the 1918 influenza virus has apparently created little stir in Spitsbergen. 32. In nature, influenza viruses circulate continuously among animals, especially birds. 33. Influenza viruses are almost unique in their ability to spread rapidly around the world.34. Both the H2N2 and H3N2 pandemic flu strains contained genes from avian influenza viruses . 35. Different influenza viruses encode for different hemagglutinin and neuraminidase proteins. 36. Effective and safe vaccines have been developed for influenza viruses . 37. Influenza viruses have a relatively high mutation rate that is characteristic of RNA viruses.38. Rational design of potent sialidase-based inhibitors of influenza virus replication. 39. Influenza virus C is different from type A and B in its growth requirements.40. Neuraminidase is an antigenic glycoprotein enzyme found on the surface of the influenza viruses .
