Journal of Cancer

E. proteins and nucleic acid. 19. The flu virus is an enveloped RNA virus that infects humans, swine, horse and chicken. The virus attaches to host cells by means of envelope glycoproteins, the hemagglutinin. When the virus is isolated from pig cells, the hemagglutinin is coded for by nucleic acid of. A. flu virus. B. humans. C. swine. D. horses. ................
................