According to the manufacturer, FluBlok is the only licensed flu vaccine that does not use eggs, antibiotics, or influenza virus in any part of the manufacturing process. FluBlok also does not contain thimerosal, gelatin, or latex.
What about Flucelvax?
Flucelvax is the first and only flu vaccine that has been approved by the FDA to use cell culture technology. What does that mean? Flucelvax is produced in closed bioreactors (basically huge metal drums), which eliminates the need to use antibiotics to create the vaccine.
Unlike the standard flu vaccine, Flucelvax doesn’t contain antibiotics or preservatives. However, it does still contain egg protein.
Flucelvax is safe to use in adults 18 and older. There are no age restrictions after the age of 18.
Update 5/22/2015: Flublok was previously approved for use in adults ages 18 – 49; it is now approved for all adults 18 and over.