I don't agree with personal attacks and hearsay.
Whether we 'like' Limbaugh or not was not the questioned posed by this thread
Limbaugh claimed that the annual flu shot was not a vaccine and he was completely, totally wrong.
Specific strains of the influenza virus, like A/Singapore/GP1908/2015 or B/Maryland/15/2016 NYMC BX-69A are grown in the allantoic cavity of embryonated chicken eggs. They are then harvested and inactivated via a combination of ultraviolet light and formaldehyde. The result is then centrifuged, purified and suspended in a buffered saline solution.
That is a vaccine. If a talk show host doesn't understand this, then he probably shouldn't be talking about it at all.