2024 Flu Season. Trivalent flu vaccines are formulated to protect against three flu viruses (an a(h1n1) virus, an a(h3n2) virus, and a b/victoria virus). Flu vaccines for the u.s.
Trivalent flu vaccines are formulated to protect against three flu viruses (an a (h1n1) virus, an a (h3n2) virus, and a b/victoria virus). As always, it’s strongly recommended that everyone 6 months of age and older get vaccinated for influenza.