Table 1. National Advisory Committee on Immunization (NACI) influenza vaccine abbreviations.
| Influenza vaccine category | Formulation | Type | Current NACI abbreviationa |
|---|---|---|---|
| Inactivated influenza vaccine (IIV) | Trivalent (IIV3) |
Standard doseb, unadjuvanted, IM administered, egg-based |
IIV3-SD |
| Adjuvantedc, IM administered, egg-based |
IIV3-Adj | ||
| High dosed, unadjuvanted, IM administered, egg-based |
IIV3-HD | ||
| Quadrivalent (IIV4) | Standard doseb, unadjuvanted, IM administered, egg-based |
IIV4-SD | |
| Standard doseb, unadjuvanted, IM administered, cell culture-based |
IIV4-cc | ||
| High dosed, unadjuvanted, IM administered, egg-based |
IIV4-HD | ||
| Live attenuated influenza vaccine (LAIV) | Trivalent (LAIV3) | Unadjuvanted, Nasal spray, egg-based |
LAIV3 |
| Quadrivalent (LAIV4) | Unadjuvanted, Nasal spray, egg-based |
LAIV4 |
Abbreviations: IIV, inactivated influenza vaccine; IIV3, trivalent inactivated influenza vaccine; IIV3-Adj, adjuvanted egg-based trivalent inactivated influenza vaccine; IIV3-HD, high-dose egg-based trivalent inactivated influenza vaccine; IIV3-SD, standard-dose egg-based trivalent inactivated influenza vaccine; IIV4, quadrivalent inactivated influenza vaccine; IIV4-cc, standard-dose cell culture-based quadrivalent inactivated influenza vaccine; IIV4-HD, high-dose egg-based quadrivalent inactivated influenza vaccine; IIV4-SD, standard-dose egg-based quadrivalent inactivated influenza vaccine; IM, intramuscular; LAIV, live attenuated influenza vaccine; LAIV3, egg-based trivalent live attenuated influenza vaccine; LAIV4, egg-based quadrivalent live attenuated influenza vaccine; NACI, National Advisory Committee on Immunization
a The numeric suffix denotes the number of antigens contained in the vaccine (“3” refers to the trivalent formulation and “4” refers to the quadrivalent formulation). The hyphenated suffix “-SD” is used when referring to IIV products that do not have an adjuvant, contain 15 µg HA per strain and are administered as a 0.5 mL dose by intramuscular injection; “-cc” refers to an IIV product that is made from influenza virus grown in cell cultures instead of chicken eggs (Flucelvax® Quad); “-Adj” refers to an IIV with an adjuvant (IIV3-Adj for Fluad® or Fluad Pediatric®); and “-HD” refers to an IIV that contains higher antigen content than 15 µg HA per strain (IIV3-HD for Fluzone® High-Dose or IIV4-HD for Fluzone® High-Dose Quadrivalent)
b 15 µg HA per strain
c 7.5 µg (in 0.25 mL) or 15 µg (in 0.5 mL) HA per strain
d 60 µg HA per strain
Source: Table reproduced from NACI Seasonal Influenza Vaccine Statement for 2021–2022 (5)