As this year’s flu season has shown, it’s a good idea to order your supply as soon as the vaccine is available. Most of the flu vaccine for the 2013-2014 season will be trivalent (three component), which offers important protection from flu.
Some quadrivalent (four-component) vaccine will also be available, according to manufacturers, but supplies are expected to be limited. All nasal spray vaccine, a small part of the total supply, is expected to be quadrivalent.
More information is available on the Centers for Disease Control and Prevention’s website.