ART4 and infection: Antibodies to surface glycoproteins (GP) on enveloped viruses (e.g. spike on coronavirus (preprint: Zost et al, 2020), hemagglutinin (HA) and neuraminidase (NA) on influenza (Burton et al, 2012) or glycoprotein (GP) on LCMV (Bruns et al, 1983)) are well known to neutralise infection.