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COVID-19 mRNA vaccine (JN.1 strain-compatible)

Development stage
Approved
Lead developer
Pfizer
Modality
mRNA Therapeutics → RNA Therapeutics → Nucleic Acid Therapeutics, Vaccines & Immunotherapeutics
Administration
Intramuscular
01

Overview

The COVID-19 mRNA vaccine (JN.1 strain-compatible) refers to a category of messenger RNA-based vaccines updated to target the SARS-CoV-2 JN.1 variant, a sublineage of the BA.2.86 (Omicron) strain. These vaccines were developed for the 2024–2025 vaccination season following recommendations from global health organizations like the WHO and regulatory agencies such as the FDA and EMA to transition to monovalent JN.1 formulations. The vaccines work by delivering mRNA encapsulated in lipid nanoparticles, which instructs host cells to synthesize the JN.1 spike protein, thereby eliciting a protective immune response including neutralizing antibodies and T-cell activation. Key products in this category include Pfizer/BioNTech's Comirnaty, Moderna's Spikevax, and Daiichi Sankyo's Daichirona, all of which have received regulatory approvals or authorizations for use as boosters or primary series in various jurisdictions.

Brand names
ComirnatySpikevaxDaichirona
Other names
JN.1-adapted COVID-19 mRNA vaccinemonovalent JN.1 mRNA vaccine2024-2025 COVID-19 mRNA vaccine
02

Targets

BCR (Immunoglobulin G B Cell Receptor)IFIH1 (MDA5)TLR7/8 (Toll-like receptor 7 (TLR7) and Toll-like receptor 8 (TLR8))ACE2 (Angiotensin-converting enzyme 2)T-cell receptor (TCR) on CD4+ helper T cells recognizing SARS-CoV-2 JN.1 spike-derived peptides presented by MHC class II

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