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RobertColumbia t1_itbft1k wrote

This is, in fact, done. Many flu vaccines are labeled "quadrivalent", which means that they provide antigens for four different flu strains. Similarly, the new (for Fall 2022) "bivalent" Covid vaccine boosters encode proteins for both the original Wuhan strain and Omicron. Gardasil-9 provides protection against nine different strains of HPV.

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