Quadrivalent Influenza Vaccine vs Trivalent

Our family all had the Quadrivalent vaccine this year, hope we all stay healthy this year!!!!

http://www.cdc.gov/flu/protect/vaccine/quadrivalent.htm

"What is quadrivalent flu vaccine?

The quadrivalent flu vaccine is designed to protect against four different flu viruses; two influenza A viruses and two influenza B viruses.
Why was the quadrivalent flu vaccine developed?

For years, flu vaccines were designed to protect against three different flu viruses (trivalent). This included an influenza A H1N1 virus, an influenza A H3N2 virus and one B virus. Experts had to choose one B virus, even though there are two very different lineages of B viruses that both circulate during most seasons. This meant the vaccine did not protect against the group of B viruses not included in the vaccine. Adding another B virus to the vaccine aims to give broader protection against circulating flu viruses...

...How much of the flu vaccines for the United States during 2016-2017 will be quadrivalent?

Of the 157 to 168 million doses of influenza vaccine projected to be available for the 2016-2017 season, manufacturers estimate that 96 million doses will be quadrivalent flu vaccine..."