What is the difference between Flublok and Flublok Quadrivalent?

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Official answer

by Drugs.com
Flublok was a trivalent influenza vaccine first licensed by the FDA in 2013. Flublok has now been replaced by Flublok Quadrivalent, which protects against four influenza strains instead of three. Flublok Quadrivalent also contains three times the active ingredients of other quadrivalent vaccines offer an advantage to people at high risk for flu complications, such as seniors or those with lowered immunity.

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