Pre-existing cross-subtype serological responses against H5Nx in health care workers
ABSTRACT A rise in cases of highly pathogenic avian influenza A (H5N1) clade 2.3.4.4b in humans has been reported since 2023. Although influenza seasonal vaccination (H1N1/H3N2) was shown to be effective against cases of reinfection with endemic influenza A viruses (IAVs), its capacity to elicit cross-reactive antibodi...