An antifreeze is an additive which lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression for cold environments and also achieves boiling-point elevation (anti-boil) to allow higher coolant temperature.
The strains of virus the trivalent vaccine protects against two A viruses (an H1N1 and an H3N2) and an influenza B virus. The quadrivalent vaccine adds another B virus to the vaccine which helps expand the level of protection to the recipient.
1 The quadrivalent flu vaccine protects against four flu viruses; two influenza A viruses and two influenza B viruses. 2  The following quadrivalent flu vaccines are: 3  a standard dose quadrivalent shot. 4  One brand is approved for people 6 months and older while others are approved for those 3 years and older. The quadrivalent flu vaccine protects against four flu viruses; two influenza A viruses and two influenza B viruses. 2  The following quadrivalent flu vaccines are: 3  a standard dose quadrivalent shot. 4  One brand is approved for people 6 months and older while others are approved for those 3 years and older.