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However, the limited number of licensed antivirals is increasingly compromised by drug resistance driven by high mutation rates. This highlights the urgent need for broad-spectrum therapeutics with novel mechanisms of action. Nanobodies, a new generation of antibody drugs, have great potential in the treatment of influenza virus infections. Neuraminidase (NA) mediates the sialic acid cleavage required for viral release, and its genetic drift is generally slower than that of hemagglutinin (HA) in influenza viruses, making it an attractive target for broad-spectrum antiviral and vaccine development. To construct a phage display nanobody library targeting NA, an alpaca was immunized with the NA protein of the H9N2 influenza virus. A specific nanobody, designated F4, was subsequently screened from the immune library. The nanobody was engineered into an Fc-fused nanobody, F4-Fc, which exhibited inhibitory activity against multiple influenza A and B viruses\n                      <jats:italic toggle=\"yes\">in vitro<\/jats:italic>\n                      and provided robust prophylactic and therapeutic protection against influenza A and influenza B virus infections\n                      <jats:italic toggle=\"yes\">in vivo<\/jats:italic>\n                      . Mechanistically, F4-Fc inhibits NA enzymatic activity and mediates antibody-dependent cellular cytotoxicity. In conclusion, F4-Fc demonstrates prophylactic and therapeutic efficacy against influenza A and B viruses, representing a promising antiviral drug candidate for influenza virus infection.\n                    <\/jats:p>\n                    <jats:sec>\n                      <jats:title>IMPORTANCE<\/jats:title>\n                      <jats:p>\n                        Influenza viruses seriously threaten human and animal health, and drugs are crucial for controlling influenza outbreaks. However, the limited variety of existing anti-influenza virus medicines and the high mutation rate of the virus have led to the continuous emergence of drug-resistant strains. Neuraminidase (NA) is a critical surface glycoprotein that exhibits slower antigenic drift than hemagglutinin (HA), making it an attractive target for cross-protective antiviral development. However, broadly active NA-targeting nanobodies, particularly those effective against both influenza A and B viruses, remain limited. Here, we constructed an Fc-fused F4 nanobody (F4-Fc) targeting neuraminidases from multiple influenza A and B viruses and demonstrated its antiviral efficacy\n                        <jats:italic toggle=\"yes\">in vitro<\/jats:italic>\n                        and protective activity\n                        <jats:italic toggle=\"yes\">in vivo<\/jats:italic>\n                        , highlighting its potential as a promising strategy for the prevention and treatment of influenza virus infection.\n                      <\/jats:p>\n                    <\/jats:sec>\n                  <\/jats:sec>","DOI":"10.1128\/jvi.00874-26","type":"journal-article","created":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T15:10:07Z","timestamp":1788189007000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["A neuraminidase-targeting nanobody as a therapeutic candidate against influenza A and B 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