“…Expression of proteins from a variety of microbial and viral pathogens showed the feasibility of transgenic plant expression systems for the production of subunit vaccines. The proteins expressed include those from the Hepatitis B surface antigen (HbsAg) in tobacco and lettuce (Ehsani, Khabiri and Domansky, 1997;Mason, Lam and Arntzen, 1992), a rabies virus antigen in tomato (McGarvey et al, 1995), a cholera antigen in tobacco and potato (Arakawa et al, 1997;Hein et al, 1996), a recombinant bacterial antigen (LT-B) in tobacco and potato (Haq et al, 1995), the Norwalk virus capsid protein (NVCP) in tobacco and potato (Mason et al, 1996) and a human cytomegalovirus antigen in tobacco (Tackaberry et al, 1999).…”