decoy particles HBSAg- containing particles are released into the serum of infected 22 nm people and outnumber the actual virions Spherical or filamentous They are immunogenic and were processed into the first commercial vaccine against HBV. 100-700mdecoy particles • HBsAg-containing particles are released into the serum of infected people and outnumber the actual virions. • Spherical or filamentous • They are immunogenic and were processed into the first commercial vaccine against HBV